This is a rework of my former build, the darkness trap is neccesary if you want consistent runs and also makes combat 10 secs faster. The placement of the dsts also has to be where it is if you want to reach wyverns that might get close to crystal.
I use builder warden with hunt guard + tb until wave 35 where I bring in 2 hunt/monk guard summs, this gets me about 5.20-5.30 combat.
You can also upgrade first wave where I get 5.10-5.20 combat.