No sorry I won't have time here in august. I don't think i'm going to be able to play another mafia game until december because I have to do marching band until november
1 town vs 1 SK is an automatic SK win. 1 town vs 1 SK vs 1 SK is not since the sks can't win with each other. If the sks killed each other night one it's a town win(Though it could depend on the variant)
Two serial killers MIGHT work, but not two full on Mafia teams. The town would be equal to the combined Mafia if they ml day one and the Mafia teams have to much voting influence for town to be effective