Your esc's although very "neat" are wrapped in too much heat insulating blanket (shrink) for my builds. I bare the heat sink and try give it intimate contact with moving air at least and if building on a metal frame I attach it in firm contact between the heat sink and the frame for best esc performance and reliability. Unless the esc's used have a Crystal oscillator then the calibration will drift a lot as the temperature changes.
Thurmond