Modding question: SOS and Strip Effects

[Guest ffabris]

So, here's the scenario: a nude NPC using SOS body (vesion 3.whatever) enters a trigger which has a strip spell. The NPC equips underwear on entering the trigger. On leaving, the underwear stays on.

 

I'm confused as to why... the effect isn't touching slot 52, which is what I thought SOS used for the schlong. Script is:

Scriptname RES_StripEffect extends activemagiceffect  

Actor Property PlayerRef Auto
Armor Property JewelryRingGold auto

Event OnEffectStart(Actor akTarget, Actor akCaster)  
    if(akTarget != PlayerRef)
        ; akTarget.unequipall()
        akTarget.UnequipItemSlot(30)
        akTarget.UnequipItemSlot(31)
        akTarget.UnequipItemSlot(32)
        akTarget.UnequipItemSlot(33)
        akTarget.UnequipItemSlot(34)
        akTarget.UnequipItemSlot(37)
        akTarget.UnequipItemSlot(38)
        akTarget.UnequipItemSlot(39)
        akTarget.UnequipItemSlot(41)
        akTarget.UnequipItemSlot(42)
    EndIf
endEvent

Event OnEffectFinish(Actor akTarget, Actor akCaster)  
    if(akTarget != PlayerRef)
        akTarget.additem(JewelryRingGold,1,true)
        akTarget.equipitem(JewelryRingGold,false,true)
        akTarget.removeitem(jewelryringgold,1,true)  
    EndIf
endEvent

If relevant, this doesn't occur with SAM - but that may use a different slot, dunno.

Any suggestions as to what might be going on here?
 

[Guest ffabris]

After trying various things, this has started to look like a race condition within SOS code. Not sure why else it would affect SOS but not SAM.