Well, a 2100Kv motor is a lot for an 8th buggy running a 4S battery, so any increase in timing will bring on a temperature increase. Plus the mambe may be able to push more current through too..... As the heat increase coincides with a change of ESC brand, then that would be my first port of call.
Lets not forget, there is a lot of 'electronic' adjustments that is done by the ESC in brushless, and all brands do it different.
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