Spawn Camp! We basically shut down the three wings and focus our middle. I am definetely overdoing it on the wings, but it works, but if we want to pull some off each end we may be able to. Basic setup is holy bulwark, 4 traps and a Mortar. 2 of the 3 have a shroom pit as well. Center we control with auras and some warden clouds to cap the ogre copters.
After only 2 test runs, this beat our Royal Gardens as the fastest Tier 1 armor farm. It is an active build, but if you remove oil traps (if you find you don't need them), you can run around once every few waves and repair, oil traps drain really fast. I was running around with a secondary Tower Boost monk during combat, who would hit the repair on the oil traps.
Buff beams are 5 DU long, so when the bulwark takes hits, they don't splash-hit the mortar.
Party: 1 TB monk, 2 summoners with huntress/monk pets (@hint5 and @hint1), 1 Roaming other (can be a raoming TB, or summoner, or whatever)
Minions are optional, but can help with sharkens coming from that lower lane.