Is there anyway to show the post group stars rather than the Main group?
Not without making the person's group into a secondary group, or one of several mods.
The point is that you'd generally want to use their primary group's badge as an indicator of rank, rather than using stars to indicate posting.
Ah. Guess Ill try the mod again for it. Kind of annoying, but I guess its like hat for a reason like most things with SMF.
It is like that for a reason: it's how most people actually seem to want it to work...