I believe it has been suggested before. But to make IF have a single Assassin unit (for variety) and the Black Acolyte either A.) Stealth or B.) Inquisition bonus, or if we are lucky C.) Both.

That would change the dynamic of the IF. I personally don't think it's weak, as much as it's very hard to play effectively. I don't ever discount being able to make alot of cheap weapons and armors, as that is how I win most of my games is by masses of minicombs.