Mob count per wave stays pretty low.  Last 2 waves had decent numbers. I don't know if this will be a good farm.  Oil trap is optional, you can move it anywhere, it didn't get much tags, just kind of 4 DU to play with still.  Biggest issue here is finding a good spot to shoot and not have TB fall off.  A simple fix to make the whole thing easier/more reliable is adding in slow auras, but maybe bring in another summoner booster.

Trying to speed this up a bit and really strong lean on the dmg-auras.

Party: 1 Tower Boost monk, 2 summoners with guardian pets (monk/huntress) 1 at each hint 1, 1 Dmg-Aura Monk builder

Keep TB up at all times.  Use the TB on the dmg-aura monk to fill during resets.

If you want to go "more safe" then you can add alow auras on each stack, but you gotta play with the stuff a bit.