(1) Place the auras in the middle as close as possible to the northern ones so you can buff both stacks with one 4 DU beam.
Two Deadly strike to clear off slow enemies and the rest are stacked LTs.
I only upgrade buff beams, if your builders or your tower buffer are not so strong you might have to upgrade more.
Stand with towerbuffer and genie on top of the towers and buff and attack.
If you dont want to wait for the tower buff cooldown after the wave has started just type killme when the wave ends (so you respawn in build phase).
Bonus: Take only monks for the last wave to get more pets.