With the backup mafia I agree with prof about the imbalance. Essentially 4 mafia, 1 SK, 1 Survivor VS 7 townies(2 of which die together essentially. quoting hat from the dead thread, "The town could have suffered a huge blow had one of the siblings got burned or poisoned early on, as the guard wouldn't have protected it any way. ") is nearly stacked as badly against town as Heph's game.
It was much less imbalanced without the backup, although mafia did have their handicaps. I said it a few times, but in my opinion the same mafia team with a one-shot normal kill(or even daykill as they eventually got) would've likely been ideal. Or a normal killing method any member could execute, with one-shot poison and I'd say a two-shot janitor.
SKs do often hit mafia, but that's part of them trying to reduce the numbers on both sides so they can win. With 3 likely town(including Wonk), it was in FF's best interests to try to hit mafia. If town was able to lynch mafia instead of trash, he probably would've wanted to hit another townie.
Instead of poisoning Stefl, it may have been best to poison night one as had happened, but get Stefl lynched day two and hopefully janitored. It's a win/win as it would've given TOS and prof townie points, and/or would've made the poison look like a one-shot with a standard kill being blocked night one, opening up a fakeclaim for a protective role. Same end result of one dead townie(or non-mafia at least) and no more poison handicap, but lynching non-mafia isn't as much of a sure thing as poisoining one.