diff --git a/src/app/shipyard/Module.js b/src/app/shipyard/Module.js
index 1019e4b5..6fd884e8 100755
--- a/src/app/shipyard/Module.js
+++ b/src/app/shipyard/Module.js
@@ -135,7 +135,7 @@ export default class Module {
    * @param {Number} modified Whether to return the raw or modified value
    * @return {Number} The value queried
    */
-  _getValue(name, modified) {
+  get(name, modified = true) {
     if (modified) {
       return this._getModifiedValue(name);
     } else {
@@ -143,6 +143,85 @@ export default class Module {
     }
   }
 
+  /**
+   * Sets mod values such that the overall result for the given stat equals value
+   * @param {String} name The name of the modification
+   * @param {Number} value The value to effectively set
+   * @param {Boolean} valueIsWithSpecial True when value includes an special
+   *                                     effects
+   */
+  set(name, value, valueIsWithSpecial) {
+    const modification = Modifications.modifications[name];
+    if (!modification || isNaN(value)) {
+      // TODO: throw?
+      return;
+    }
+
+    let baseValue = this[name];
+    let modValue = 0;
+    if (modification.method === 'overwrite') {
+      modValue = value;
+    } else if (modification.method === 'additive') {
+      // additive modifications can be given without a base value
+      if (!baseValue) {
+        baseValue = 0;
+      }
+      modValue = value - baseValue;
+      if (this.grp === 'hr' &&
+        (name === 'kinres' || name === 'thermres' || name === 'explres')) {
+          modValue = modValue / (1 - baseValue);
+      }
+    } else if (name === 'shieldboost' || name === 'hullboost') {
+      modValue = (1 + value) / (1 + baseValue) - 1;
+    } else { // multiplicative
+      modValue = value / baseValue - 1;
+    }
+
+    if (modification.type === 'percentage') {
+      modValue = modValue * 10000;
+    } else if (modification.type === 'numeric' && name !== 'burst' &&
+      name !== 'burstrof') {
+        modValue = modValue * 100;
+    }
+
+    this.setModValue(name, modValue, valueIsWithSpecial);
+  }
+
+  /**
+   * Returns a value for a given modification in pretty format, i.e. percentages
+   * are returned as 90 not as 0.9.
+   * @param {String} name Name of the modification to get the value for
+   * @param {Boolean} [modified = true] If set to false, the raw value of the
+   *                                    raw value of the stat is returned
+   * @param {Number} [places = 2] Number of decimal places to round
+   * @return {Number} Value for given stat
+   */
+  getPretty(name, modified = true, places = 2) {
+    const formatingOptions = STATS_FORMATING[name];
+    let val = this.get(name, modified) || 0;
+    if (formatingOptions && formatingOptions.format.startsWith('pct')) {
+      return 100 * val;
+    }
+    // Round to two decimal places
+    let precisionMult = 10 ** places;
+    return Math.round(val * precisionMult) / precisionMult;
+  }
+
+  /**
+   * Same as {@see Module#set} but values expects value that are percentages to
+   * come in format 90 as opposed to 0.9.
+   * @param {String} name The name of the modification
+   * @param {Number} value The value to effectively set
+   * @param {Boolean} valueIsWithSpecial True when value includes an special
+   */
+  setPretty(name, value, valueIsWithSpecial) {
+    const formatingOptions = STATS_FORMATING[name];
+    if (formatingOptions && formatingOptions.format.startsWith('pct')) {
+      value = value / 100;
+    }
+    this.set(name, value, valueIsWithSpecial);
+  }
+
   /**
    * Helper to obtain a modified value using standard multipliers
    * @param {String}  name     the name of the modifier to obtain
@@ -164,34 +243,34 @@ export default class Module {
           modValue = this.getModValue(name);
         }
         if (modValue) {
-        if (!result && modification.method === 'additive') {
-          // If the modification is additive and no value is given by default we
-          // start at zero
-          result = 0;
-        }
-
-        if (result !== undefined) {
-          if (modification.method === 'additive') {
-            // Resistance modding for hull reinforcement packages has additional
-            // diminishing returns implemented. The mod value gets lowered by
-            // the amount of base resistance the hrp has.
-            if (this.grp === 'hr' &&
-              (name === 'kinres' || name === 'thermres' || name === 'explres')) {
-                modValue = modValue * (1 - result);
-            }
-            result = result + modValue;
-          } else if (modification.method === 'overwrite') {
-            result = modValue;
-          } else if (name === 'shieldboost' || name === 'hullboost') {
-            result = (1 + result) * (1 + modValue) - 1;
-          } else {
-            result = result * (1 + modValue);
+          if (!result && modification.method === 'additive') {
+            // If the modification is additive and no value is given by default we
+            // start at zero
+            result = 0;
           }
-        } else if (name === 'burst' || name === 'burstrof') {
-          // Burst and burst rate of fire are special, as it can not exist but
-          // have a modification
-          result = modValue / 100;
-      }
+
+          if (result !== undefined) {
+            if (modification.method === 'additive') {
+              // Resistance modding for hull reinforcement packages has additional
+              // diminishing returns implemented. The mod value gets lowered by
+              // the amount of base resistance the hrp has.
+              if (this.grp === 'hr' &&
+                (name === 'kinres' || name === 'thermres' || name === 'explres')) {
+                  modValue = modValue * (1 - result);
+              }
+              result = result + modValue;
+            } else if (modification.method === 'overwrite') {
+              result = modValue;
+            } else if (name === 'shieldboost' || name === 'hullboost') {
+              result = (1 + result) * (1 + modValue) - 1;
+            } else {
+              result = result * (1 + modValue);
+            }
+          } else if (name === 'burst' || name === 'burstrof') {
+            // Burst and burst rate of fire are special, as it can not exist but
+            // have a modification
+            result = modValue / 100;
+        }
       }
     }
 
@@ -266,7 +345,7 @@ export default class Module {
    * @return {Number} the power generation of this module
    */
   getPowerGeneration(modified = true) {
-    return this._getValue('pgen', modified);
+    return this.get('pgen', modified);
   }
 
   /**
@@ -275,7 +354,7 @@ export default class Module {
    * @return {Number} the power usage of this module
    */
   getPowerUsage(modified = true) {
-    return this._getValue('power', modified);
+    return this.get('power', modified);
   }
 
   /**
@@ -284,7 +363,7 @@ export default class Module {
    * @return {Number} the integrity of this module
    */
   getIntegrity(modified = true) {
-    return this._getValue('integrity', modified);
+    return this.get('integrity', modified);
   }
 
   /**
@@ -293,7 +372,7 @@ export default class Module {
    * @return {Number} the mass of this module
    */
   getMass(modified = true) {
-    return this._getValue('mass', modified);
+    return this.get('mass', modified);
   }
 
   /**
@@ -302,7 +381,7 @@ export default class Module {
    * @return {Number} the thermal efficiency of this module
    */
   getThermalEfficiency(modified = true) {
-    return this._getValue('eff', modified);
+    return this.get('eff', modified);
   }
 
   /**
@@ -311,7 +390,7 @@ export default class Module {
    * @return {Number} the maximum fuel per jump of this module
    */
   getMaxFuelPerJump(modified = true) {
-    return this._getValue('maxfuel', modified);
+    return this.get('maxfuel', modified);
   }
 
   /**
@@ -320,7 +399,7 @@ export default class Module {
    * @return {Number} the systems capacity of this module
    */
   getSystemsCapacity(modified = true) {
-    return this._getValue('syscap', modified);
+    return this.get('syscap', modified);
   }
 
   /**
@@ -329,7 +408,7 @@ export default class Module {
    * @return {Number} the engines capacity of this module
    */
   getEnginesCapacity(modified = true) {
-    return this._getValue('engcap', modified);
+    return this.get('engcap', modified);
   }
 
   /**
@@ -338,7 +417,7 @@ export default class Module {
    * @return {Number} the weapons capacity of this module
    */
   getWeaponsCapacity(modified = true) {
-    return this._getValue('wepcap', modified);
+    return this.get('wepcap', modified);
   }
 
   /**
@@ -347,7 +426,7 @@ export default class Module {
    * @return {Number} the systems recharge rate of this module
    */
   getSystemsRechargeRate(modified = true) {
-    return this._getValue('sysrate', modified);
+    return this.get('sysrate', modified);
   }
 
   /**
@@ -356,7 +435,7 @@ export default class Module {
    * @return {Number} the engines recharge rate of this module
    */
   getEnginesRechargeRate(modified = true) {
-    return this._getValue('engrate', modified);
+    return this.get('engrate', modified);
   }
 
   /**
@@ -365,7 +444,7 @@ export default class Module {
    * @return {Number} the weapons recharge rate of this module
    */
   getWeaponsRechargeRate(modified = true) {
-    return this._getValue('weprate', modified);
+    return this.get('weprate', modified);
   }
 
   /**
@@ -374,7 +453,7 @@ export default class Module {
    * @return {Number} the kinetic resistance of this module
    */
   getKineticResistance(modified = true) {
-    return this._getValue('kinres', modified);
+    return this.get('kinres', modified);
   }
 
   /**
@@ -383,7 +462,7 @@ export default class Module {
    * @return {Number} the thermal resistance of this module
    */
   getThermalResistance(modified = true) {
-    return this._getValue('thermres', modified);
+    return this.get('thermres', modified);
   }
 
   /**
@@ -392,7 +471,7 @@ export default class Module {
    * @return {Number} the explosive resistance of this module
    */
   getExplosiveResistance(modified = true) {
-    return this._getValue('explres', modified);
+    return this.get('explres', modified);
   }
 
   /**
@@ -401,7 +480,7 @@ export default class Module {
    * @return {Number} the caustic resistance of this module
    */
   getCausticResistance(modified = true) {
-    return this._getValue('causres', modified);
+    return this.get('causres', modified);
   }
 
   /**
@@ -410,7 +489,7 @@ export default class Module {
    * @return {Number} the regeneration rate of this module
    */
   getRegenerationRate(modified = true) {
-    return this._getValue('regen', modified);
+    return this.get('regen', modified);
   }
 
   /**
@@ -419,7 +498,7 @@ export default class Module {
    * @return {Number} the broken regeneration rate of this module
    */
   getBrokenRegenerationRate(modified = true) {
-    return this._getValue('brokenregen', modified);
+    return this.get('brokenregen', modified);
   }
 
   /**
@@ -428,7 +507,7 @@ export default class Module {
    * @return {Number} the range rate of this module
    */
   getRange(modified = true) {
-    return this._getValue('range', modified);
+    return this.get('range', modified);
   }
 
   /**
@@ -439,7 +518,7 @@ export default class Module {
   getFalloff(modified = true) {
     if (!modified) {
       const range = this.getRange(false);
-      const falloff = this._getValue('falloff', false);
+      const falloff = this.get('falloff', false);
       return (falloff > range ? range : falloff);
     }
 
@@ -465,7 +544,7 @@ export default class Module {
    * @return {Number} the range of this module
    */
   getRangeT(modified = true) {
-    return this._getValue('ranget', modified);
+    return this.get('ranget', modified);
   }
 
   /**
@@ -474,7 +553,7 @@ export default class Module {
    * @return {Number} the scan time of this module
    */
   getScanTime(modified = true) {
-    return this._getValue('scantime', modified);
+    return this.get('scantime', modified);
   }
 
   /**
@@ -483,7 +562,7 @@ export default class Module {
    * @return {Number} the capture arc of this module
    */
   getCaptureArc(modified = true) {
-    return this._getValue('arc', modified);
+    return this.get('arc', modified);
   }
 
   /**
@@ -492,7 +571,7 @@ export default class Module {
    * @return {Number} the hull reinforcement of this module
    */
   getHullReinforcement(modified = true) {
-    return this._getValue('hullreinforcement', modified);
+    return this.get('hullreinforcement', modified);
   }
 
   /**
@@ -501,7 +580,7 @@ export default class Module {
    * @return {Number} the protection of this module
    */
   getProtection(modified = true) {
-    return this._getValue('protection', modified);
+    return this.get('protection', modified);
   }
 
   /**
@@ -510,7 +589,7 @@ export default class Module {
    * @return {Number} the delay of this module
    */
   getDelay(modified = true) {
-    return this._getValue('delay', modified);
+    return this.get('delay', modified);
   }
 
   /**
@@ -519,7 +598,7 @@ export default class Module {
    * @return {Number} the duration of this module
    */
   getDuration(modified = true) {
-    return this._getValue('duration', modified);
+    return this.get('duration', modified);
   }
 
   /**
@@ -528,7 +607,7 @@ export default class Module {
    * @return {Number} the shield boost of this module
    */
   getShieldBoost(modified = true) {
-    return this._getValue('shieldboost', modified);
+    return this.get('shieldboost', modified);
   }
 
   /**
@@ -555,7 +634,7 @@ export default class Module {
    * @return {Number} the optimum mass of this module
    */
   getOptMass(modified = true) {
-    return this._getValue('optmass', modified);
+    return this.get('optmass', modified);
   }
 
   /**
@@ -646,7 +725,7 @@ export default class Module {
    * @return {Number} the damage of this module
    */
   getDamage(modified = true) {
-    return this._getValue('damage', modified);
+    return this.get('damage', modified);
   }
 
   /**
@@ -655,7 +734,7 @@ export default class Module {
    * @return {Number} the distributor draw of this module
    */
   getDistDraw(modified = true) {
-    return this._getValue('distdraw', modified);
+    return this.get('distdraw', modified);
   }
 
   /**
@@ -664,7 +743,7 @@ export default class Module {
    * @return {Number} the thermal load of this module
    */
   getThermalLoad(modified = true) {
-    return this._getValue('thermload', modified);
+    return this.get('thermload', modified);
   }
 
   /**
@@ -673,7 +752,7 @@ export default class Module {
    * @return {Number} the rounds per shot of this module
    */
   getRoundsPerShot(modified = true) {
-    return this._getValue('roundspershot', modified);
+    return this.get('roundspershot', modified);
   }
 
   /**
@@ -755,7 +834,7 @@ export default class Module {
    */
   getClip(modified = true) {
     // Clip size is always rounded up
-    let result = this._getValue('clip', modified);
+    let result = this.get('clip', modified);
     if (result) { result = Math.ceil(result); }
     return result;
   }
@@ -766,7 +845,7 @@ export default class Module {
    * @return {Number} the ammo size of this module
    */
   getAmmo(modified = true) {
-    return this._getValue('ammo', modified);
+    return this.get('ammo', modified);
   }
 
   /**
@@ -775,7 +854,7 @@ export default class Module {
    * @return {Number} the reload time of this module
    */
   getReload(modified = true) {
-    return this._getValue('reload', modified);
+    return this.get('reload', modified);
   }
 
   /**
@@ -784,7 +863,7 @@ export default class Module {
    * @return {Number} the burst size of this module
    */
   getBurst(modified = true) {
-    return this._getValue('burst', modified);
+    return this.get('burst', modified);
   }
 
   /**
@@ -793,7 +872,7 @@ export default class Module {
    * @return {Number} the burst rate of fire of this module
    */
   getBurstRoF(modified = true) {
-    return this._getValue('burstrof', modified);
+    return this.get('burstrof', modified);
   }
 
   /**
@@ -808,7 +887,7 @@ export default class Module {
   getRoF(modified = true) {
     const burst = this.getBurst(modified) || 1;
     const burstRoF = this.getBurstRoF(modified) || 1;
-    const intRoF = this._getValue('rof', modified);
+    const intRoF = this.get('rof', modified);
 
     return burst / (((burst - 1) / burstRoF) + 1 / intRoF);
   }
@@ -819,7 +898,7 @@ export default class Module {
    * @return {Number} the facing limit for this module
    */
   getFacingLimit(modified = true) {
-    return this._getValue('facinglimit', modified);
+    return this.get('facinglimit', modified);
   }
 
   /**
@@ -828,7 +907,7 @@ export default class Module {
    * @return {Number} the hull boost for this module
    */
   getHullBoost(modified = true) {
-    return this._getValue('hullboost', modified);
+    return this.get('hullboost', modified);
   }
 
   /**
@@ -837,7 +916,7 @@ export default class Module {
    * @return {Number} the shield reinforcement for this module
    */
   getShieldReinforcement(modified = true) {
-    return this._getValue('shieldreinforcement', modified);
+    return this.get('shieldreinforcement', modified);
   }
 
   /**
@@ -846,7 +925,7 @@ export default class Module {
    * @return {Number} the shield addition for this module
    */
   getShieldAddition(modified = true) {
-    return this._getValue('shieldaddition', modified);
+    return this.get('shieldaddition', modified);
   }
 
   /**
@@ -855,7 +934,7 @@ export default class Module {
    * @return {Number} the jump range boost for this module
    */
   getJumpBoost(modified = true) {
-    return this._getValue('jumpboost', modified);
+    return this.get('jumpboost', modified);
   }
 
   /**
@@ -864,7 +943,7 @@ export default class Module {
    * @return {Number} the piercing for this module
    */
   getPiercing(modified = true) {
-    return this._getValue('piercing', modified);
+    return this.get('piercing', modified);
   }
 
   /**
@@ -873,7 +952,7 @@ export default class Module {
    * @return {Number} the bays for this module
    */
   getBays(modified) {
-    return this._getValue('bays', modified);
+    return this.get('bays', modified);
   }
 
   /**
@@ -882,7 +961,7 @@ export default class Module {
    * @return {Number} the rebuilds per bay for this module
    */
   getRebuildsPerBay(modified = true) {
-    return this._getValue('rebuildsperbay', modified);
+    return this.get('rebuildsperbay', modified);
   }
 
   /**
@@ -891,7 +970,7 @@ export default class Module {
    * @return {Number} the jitter for this module
    */
   getJitter(modified = true) {
-    return this._getValue('jitter', modified);
+    return this.get('jitter', modified);
   }
 
   /**
@@ -909,7 +988,7 @@ export default class Module {
    * @return {string} the shot speed for this module
    */
   getShotSpeed(modified = true) {
-    return this._getValue('shotspeed', modified);
+    return this.get('shotspeed', modified);
   }
 
   /**
@@ -918,7 +997,7 @@ export default class Module {
    * @return {string} the spinup for this module
    */
   getSpinup(modified = true) {
-    return this._getValue('spinup', modified);
+    return this.get('spinup', modified);
   }
 
   /**
@@ -927,7 +1006,7 @@ export default class Module {
    * @return {string} the time for this module
    */
   getTime(modified = true) {
-    return this._getValue('time', modified);
+    return this.get('time', modified);
   }
 
   /**
@@ -936,7 +1015,7 @@ export default class Module {
    * @return {string} the time for this module
    */
   getHackTime(modified = true) {
-    return this._getValue('hacktime', modified);
+    return this.get('hacktime', modified);
   }
 
 }
diff --git a/src/app/shipyard/Ship.js b/src/app/shipyard/Ship.js
index 87be0b90..00f903ad 100755
--- a/src/app/shipyard/Ship.js
+++ b/src/app/shipyard/Ship.js
@@ -493,68 +493,62 @@ export default class Ship {
    * @param {Object} name       The name of the modification to change
    * @param {Number} value The new value of the modification.  The value of the modification is scaled to provide two decimal places of precision in an integer.  For example 1.23% is stored as 123
    * @param {bool}   sentfromui True if this update was sent from the UI
+   * @param {bool}   isAbsolute True if value is an absolute value and not a
+   *                            modification value
    */
-  setModification(m, name, value, sentfromui) {
+  setModification(m, name, value, sentfromui, isAbsolute) {
     if (isNaN(value)) {
       // Value passed is invalid; reset it to 0
       value = 0;
     }
+
+    if (isAbsolute) {
+      m.setPretty(name, value, sentfromui);
+    } else {
+      m.setModValue(name, value, sentfromui);
+    }
+
     // Handle special cases
     if (name === 'pgen') {
       // Power generation
-      m.setModValue(name, value, sentfromui);
       this.updatePowerGenerated();
     } else if (name === 'power') {
       // Power usage
-      m.setModValue(name, value, sentfromui);
       this.updatePowerUsed();
     } else if (name === 'mass') {
       // Mass
-      m.setModValue(name, value, sentfromui);
       this.recalculateMass();
       this.updateMovement();
       this.updateJumpStats();
     } else if (name === 'maxfuel') {
-      m.setModValue(name, value, sentfromui);
       this.updateJumpStats();
     } else if (name === 'optmass') {
-      m.setModValue(name, value, sentfromui);
       // Could be for any of thrusters, FSD or shield
       this.updateMovement();
       this.updateJumpStats();
       this.recalculateShield();
     } else if (name === 'optmul') {
-      m.setModValue(name, value, sentfromui);
       // Could be for any of thrusters, FSD or shield
       this.updateMovement();
       this.updateJumpStats();
       this.recalculateShield();
     } else if (name === 'shieldboost') {
-      m.setModValue(name, value, sentfromui);
       this.recalculateShield();
     } else if (name === 'hullboost' || name === 'hullreinforcement' || name === 'modulereinforcement') {
-      m.setModValue(name, value, sentfromui);
       this.recalculateArmour();
     } else if (name === 'shieldreinforcement') {
-      m.setModValue(name, value, sentfromui);
       this.recalculateShieldCells();
     } else if (name === 'burst' || name == 'burstrof' || name === 'clip' || name === 'damage' || name === 'distdraw' || name === 'jitter' || name === 'piercing' || name === 'range' || name === 'reload' || name === 'rof' || name === 'thermload') {
-      m.setModValue(name, value, sentfromui);
       this.recalculateDps();
       this.recalculateHps();
       this.recalculateEps();
     } else if (name === 'explres' || name === 'kinres' || name === 'thermres') {
-      m.setModValue(name, value, sentfromui);
       // Could be for shields or armour
       this.recalculateArmour();
       this.recalculateShield();
     } else if (name === 'engcap') {
-      m.setModValue(name, value, sentfromui);
       // Might have resulted in a change in boostability
       this.updateMovement();
-    } else {
-      // Generic
-      m.setModValue(name, value, sentfromui);
     }
   }