What's interesting is that I probably could have had an even higher body count. But I really didn't want to kill the poor villagers on the mountain, as opposed to the whackjobs who "sacrificed" me in Inferiae. I would have had even more SP if I had specced for an Abyss run. Maybe killing Cassius would have put me past the threshold.
Ah well. A character who can kill Agathoth clearly does not desperately need an SP boost, especially with personally forged skymetal weapons, a fully charged power suit, and 4 HP regeneration per round.
EDIT: If you haven't, it's also a good time to buy Colony Ship on GOG.com. I'm loading it now.