In my mind these figures help define the flavor of their factions. The belles help show how the rezzers make horrible twisted versions of their past lives more powerful in undeath and the austringer helps enforce how the guild is the best faction with a gun. There doesn't seem to be any reason to cuddle these models unless you want each faction to be nothing more than a reskin of models elsewhere. Balance does not require symmetry.
The austringer is yes, going to hit someone, and deal a bit of damage, but that doesn't seem that worrisome. The belles can reliably cast lure, good, that is what they are there for. But they don't do damage or have any other real utility besides being rather tanky. I firmly believe that niche models can have stats comprable to masters and enforcers in order to reliably affect the game. If the only use of minions is to kill other minions while the big models play together, then the game has lost sight of what skirmish sized games are about. I personally love the belles and austringer as are, and having played both with and against them recently, I think they are completely appropriate in terms of flavor and power.