The first runs are in first gear then you see me adjust something on Maxx (Shifting to @nd gear manually Going to get single gear kit from gorillamaxx) then I check the temp on the esc by hand. Temp. not too bad.
A friend of mine runs his max on a single 4600 with two 3S 6Ah packs in parallel. It runs well, stays cool, and gets around 1.5 hours of runtime when just bashing around. It seems that the MM system can do ok in the max as long as you don't get crazy.