It's not an op build. Ok, Tavern Brawler is a borderline feat. But the only thing what is really op is the strength potion available in overabundance. Even in my playthroughs (I always kill Ethel) I got enough of the nonsense-stuff. Also "nice" with the Titan bow. Such a stupid game design is remarkable in itself, but that's an old topic. In my current playthrough I decided to avoid such violation to decency, it's hard to explain to ban Haste from use to casters or remove vulnerability from Wet but slurp strength potions. With the potion gone, hit chance problems arise, something you have to deal with. I thought we are playing such games to get problems to deal with.