This is ridiculously weak camp for level 57. The issue I normally facing with torchers: that I almost always loose sicarios. Long rebuilding time: If I loose 2 torchers - 1 hour recruitment time. 5 minutes play, 1hour wait - boring. IMHO This camp is better played with torchers and medicos combos. Your approach would never work with the high concentrate of building in the center and massive damage skills where RL damage is like 1700 (x5).My Torchers are level 8.
I can't remember the exact %, he had a mix of mostly RL Health and few Buildings Health.
Here's the video: