It’s unfortunate we have to deal with low player games of 8 or 9 players in Alpha, but it’s an unavoidable circumstance.
In these types of games, it can be horribly imbalanced both for all factions. If Sheriff finds an Unseen on night 1 (which is 100% more likely with only 8 people, compared to 16), then the Unseen are pretty ruined for the rest of the game, since 2 roles (25% of the people) are now confirmed. On the contrary, Unseen can get a lucky kill on a Sheriff on night 1, and now they’re in control.
Personally, Sheriff’s strength is greatly enhanced in low player games, and the ability to even just cut down to one or two sus or quiet people to check on any given day is much stronger in low player games.
I would like to experiment with a different balance of required roles for games of 8-9 players only. Instead of spawning a required Sheriff, I feel a Princess would be better suited. My suggestion is to remove Sheriff from 8-9 player games and instead spawn a Princess, who can only find killers. This gives the Mastermind full hiding capability, even beyond first 3 nights, and it’s up to the court to just piece together which roles have been confirmed and which haven’t. Also, it gives better hiding ability for the first converted Unseen.