RE: 4 motor electric wiring
I admit this is not good advise for a beginner and should not be attempted without meters or an o-scope. If you see high current pulses then your switching frequency is too low (hard to do with a big out-runner). A single pulse should not result in any significant current. MOSFETs can switch much more current than their continuos rating, which is based on power dissipation.
To make controlling power with the throttle work the ESC must be set to have fixed end points. I've been running that motor at 1000 watts on 12S1P 2100mAh by controlling the throttle setting to limit the current to 22 amps, it works great, nothing gets hot. As the prop unloads and throttle pulse width gets longer to keep the current at 22 amps, the rpm increases from 6800 to 9100.