@RFrancis: Ronald ran settings 2-5-0-0 in TC-Spec and geared X11 4.5t at ~8.5:1 at RCS track in Thailand, he was clearly the guy with most power in the A-main...
As for temps: please use the Internal-TempCheck-System to readout speedo temperature after the run, just measuring the heatsink temp will not mean much! Motor with sintered magnets should not reach more then 90°C and with bonded 75°C, measured on can.
@flodo: 16ga is fine for your use.