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 won't need them), you can run around once every few waves and repair. I was running around with a secondary Tower Booster that would hit the repair on the oil traps.
Buff beams are 5 DU long, so when the bulwark takes hits, they don't splash to 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.