So get that Summoner geared up: (Tower Health and Tower Dmg as high as you can, once you have 2 perfect rocks or near perfect rocks, you don't need to worry about range or rate. Rate soft-caps at 1200)
Monk the radius won't make much difference after 1700 (It'll make a difference, but it's really really small, I wouldn't worry about it), and to be honest the Health of 1500~ is pretty managable just repairing or tower boosting once in a while, so I would say Stack more TDMG and TATCKRATE (To make those Electric Auras fry the monsters, and fry them fast!)