diff --git a/eos/effects/damagecontrol.py b/eos/effects/damagecontrol.py
index 05589e15a..f563fac03 100644
--- a/eos/effects/damagecontrol.py
+++ b/eos/effects/damagecontrol.py
@@ -11,6 +11,5 @@ def handler(fit, module, context):
             bonus = "%s%sDamageResonance" % (attrPrefix, damageType)
             bonus = "%s%s" % (bonus[0].lower(), bonus[1:])
             booster = "%s%sDamageResonance" % (layer, damageType)
-            penalize = False if layer == 'hull' else True
             fit.ship.multiplyItemAttr(bonus, module.getModifiedItemAttr(booster),
-                                      stackingPenalties=penalize, penaltyGroup="preMul")
+                                      stackingPenalties=True, penaltyGroup="preMul")
diff --git a/eos/effects/emergencyhullenergizer.py b/eos/effects/emergencyhullenergizer.py
index 8a281f74c..c2de4f4f5 100644
--- a/eos/effects/emergencyhullenergizer.py
+++ b/eos/effects/emergencyhullenergizer.py
@@ -8,4 +8,6 @@ runtime = "late"
 
 def handler(fit, src, context):
     for dmgType in ('em', 'thermal', 'kinetic', 'explosive'):
-        fit.ship.forceItemAttr('{}DamageResonance'.format(dmgType), src.getModifiedItemAttr("hull{}DamageResonance".format(dmgType.title())))
+        fit.ship.multiplyItemAttr('{}DamageResonance'.format(dmgType),
+                                  src.getModifiedItemAttr("hull{}DamageResonance".format(dmgType.title())),
+                                  stackingPenalties=True, penaltyGroup="postMul")
diff --git a/gui/builtinItemStatsViews/itemMutator.py b/gui/builtinItemStatsViews/itemMutator.py
index 3e9edc582..dc91453fa 100644
--- a/gui/builtinItemStatsViews/itemMutator.py
+++ b/gui/builtinItemStatsViews/itemMutator.py
@@ -46,8 +46,18 @@ class ItemMutator(wx.Panel):
 
         for m in sorted(stuff.mutators.values(), key=lambda x: x.attribute.displayName):
             # Format: [raw value, modifier applied to base raw value, display value]
-            minRange = (m.minValue, m.attribute.unit.SimplifyValue(m.minValue))
-            maxRange = (m.maxValue, m.attribute.unit.SimplifyValue(m.maxValue))
+            range1 = (m.minValue, m.attribute.unit.SimplifyValue(m.minValue))
+            range2 = (m.maxValue, m.attribute.unit.SimplifyValue(m.maxValue))
+
+            # minValue/maxValue do not always correspond to min/max, because these are
+            # just base value multiplied by minMod/maxMod, and in case base is negative
+            # minValue is actually bigger than maxValue
+            if range1[0] <= range2[0]:
+                minRange = range1
+                maxRange = range2
+            else:
+                minRange = range2
+                maxRange = range1
 
             if (m.highIsGood and minRange[0] >= maxRange[0]) or (not m.highIsGood and minRange[0] <= maxRange[0]):
                 betterRange = minRange
@@ -66,10 +76,10 @@ class ItemMutator(wx.Panel):
             # If base value is outside of mutation range, make sure that center of slider
             # corresponds to the value which is closest available to actual base value. It's
             # how EVE handles it
-            if m.minValue <= m.baseValue <= m.maxValue:
+            if minRange[0] <= m.baseValue <= maxRange[0]:
                 sliderBaseValue = m.baseValue
             else:
-                sliderBaseValue = max(m.minValue, min(m.maxValue, m.baseValue))
+                sliderBaseValue = max(minRange[0], min(maxRange[0], m.baseValue))
 
             headingSizer = wx.BoxSizer(wx.HORIZONTAL)