I've tried this lately with max bind demon / mastery / tainted / boil (but not synergies) build (using hex:purge for the attack speed), with a mist colossus xbow. I'm not sure it's worth using such a slow base but I had it around from a mule. With a conviction+might merc, a holy freeze amp urdar, one tainted @ 30k+ dmg, and the mist I'm reaching like 15k rating and around 6k max phys per bolt (so 30k phys if they all hit, supposedly). It is certainly a fraction of the damage of the bound demon's swings, but they pierce and work in conjunction quite well with the single tainted (I opt to use one tainted and buff the xbow with a sacrificial goat).
Also I just changed the xbow setup to grief pb + sorb and cleared the uber ancients pretty easily. I dunno. With full gear, I kind of feel like with the sunder tainted and the max bound demon, you can basically do whatever you want because they will steamroll the game on their own. The big question IMO is does the xbow/melee beat out using blood boil, and TBH I'm not really sure. The crossbow or melee/cleave does work much faster for bosses and heralds, though.
also if you go with a bow/crossbow with the tainted at the same time, don't get insta deleted by dolls from a bad teleport because of how quickly the tainted's fireball launches from the end of your teleport... better to just tele with your swap side for that
