I don't see any problems in having victory conditions that are easier in some games than in others. That's what it's intended: we want a flexible game.
Hell and the AC counter should work in a way that benefits AV and hurts others... except from OO, I think. OO should not benefit from hell, but it should be protected from it (kinda reasonable since them being acuatic they should be protected from hell, at least until a very high AC). Currently OO are the looser evil choice.