Yes there may be some balance issues. 2 mafia weren't able to take out the town in Mafia V even though the detective was offed round 2. 3 mafia lost in TGF2 even though none of them were caught by the detective. TGF2 was very close however. I'd suggest having 3 rebels in all of your setups, and decreasing the number of pro-town roles as the size of the town increases, since large towns make it more difficult for mafia.
Great write up to start the game with btw.
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