I'll look at using the map class instead of set, that sounds better from what you say, I was hoping you'd suggest something easier than what I did
I'm a bit unclear what you mean by the buff fade side of things. The lull line is the only one that actually puts a buff on a mob and it does fade fine. I get a message in game telling me when Pacify for example wears off. The mem blur line doesn't use a buff slot. The alliance line is active until you zone there is no buff to fade in that case. That is why I stuck the ClearFactionBonuses call in the zone code.
Get back to me and I'll make adjustments as needed. I'll work on rewriting with the MAP class instead of SET and adding the SpellAffectIndex Enum in the mean time.