make sure hint 1 cloud tower has clean line of sight down that lane.
2 TB monks (at hint 5s), 2 Summoners with huntress/monk pets (1 at each stack hint 1 and hint 2) and note at hint 2, you want the summoner North West to catch all the Auras by that West Crystal as well.
Hint 4 is the only spot that doesn't get boosted during combat.
Test run combat time 24:39
total mobs 18,857 = 770 kills/min
but was rough learning curve, I think we can do lots better.
Test run #2 combat time 22:41
total mobs 18,857 = 830 kills/min
could still get faster, as I made some changes mid run.
Test run #4 combat time 23:33 (made some mistakes and mid-run changes)