diff --git a/src/engine/wpakpowers/WpakPowerManager.java b/src/engine/wpakpowers/WpakPowerManager.java
index 64729eed..9066b004 100644
--- a/src/engine/wpakpowers/WpakPowerManager.java
+++ b/src/engine/wpakpowers/WpakPowerManager.java
@@ -423,18 +423,26 @@ public class WpakPowerManager {
         Pair<Float, Float> outData = new Pair<>(0f, 0f);
 
         // Only a subset of these ModTypes used for percents
-        // are multiplicative.  Everything else is additive.
+        // are multiplicative.  These have compound curves
+        // with "SIVL" as a prefix.  (Suggests interpolation)
 
         if (modifierEntry.percentage != 0f) {
-            outData.first = modifierEntry.percentage + (modifierEntry.compoundCurveType.getValue() * rank);
+            outData.first = modifierEntry.compoundCurveType.name().contains("SIVL") ?
+                    modifierEntry.percentage * (1 + (modifierEntry.compoundCurveType.getValue() * rank)) :
+                    modifierEntry.percentage + (modifierEntry.compoundCurveType.getValue() * rank);
             outData.first = outData.first * 0.01f;
             return outData;
         }
 
-        // As there is a min/max we return both as a pai in linear moder
+        // As there is a min/max we return both as a pair
 
-        outData.first = modifierEntry.min + (modifierEntry.compoundCurveType.getValue() * rank);
-        outData.second = modifierEntry.max + (modifierEntry.compoundCurveType.getValue() * rank);
+        outData.first = modifierEntry.compoundCurveType.name().contains("SIVL") ?
+                modifierEntry.min * (1 + (modifierEntry.compoundCurveType.getValue() * rank)) :
+                modifierEntry.min + (modifierEntry.compoundCurveType.getValue() * rank);
+
+        outData.second = modifierEntry.compoundCurveType.name().contains("SIVL") ?
+                modifierEntry.max * (1 + (modifierEntry.compoundCurveType.getValue() * rank)) :
+                modifierEntry.max + (modifierEntry.compoundCurveType.getValue() * rank);
         return outData;
     }