I agree that the game leans towards the cult when the SK gets lynched day 1. Also, the mass-claim made it easy for Neoteny to decide who was vanilla. I don't think the game was really that unbalanced though. Remember that the Cult can be hindered by the JK or SK jailing/killing their target.
How would you like to try again with exactly the same roles? See how it turns out as an open game.