War in Heaven.

I realize the appeal of Pirate Ship Mafia, and I also appreciate your desire to tweak it and get it just right, but I have a feeling it will go the other way and simply be a mindless slaughter due to the chaos of "he who is lucky enough to be mafia" inflicting a lot of pain on everyone else, until (most likely) the rival mafia kills them. Plus vig groups who add to the carnage... a half dozen kills per night until it's an easy victory for the luckiest faction. Doesn't feel like Pirate Ships and traitors anymore, it feels like a group of nuts in an insane asylum. The game will progress too fast and too bloodily for any sort of analysis to work. Were it not for some early deaths of the mafia in PSM, the game would have been balanced. Putting too much against the town might make a mafia victory more likely, but it was already pretty likely were it not for some quick, cheap deaths in the town's favor, methinks.

On the other hand, I think I would enjoy War in Heaven much much more.... no idea what to expect, and that's what I like.