As other posters here have commented at least part of the problem is very probably down to the gear diff. I tried one in my own 22 mid motor, plus my son has a 22 RTR rear motor with a gear diff and I have switched back to a ball diff as it gives better corner exit traction.
The gear diff was ok on carpet but a bit 'loose' on slippy floor sections when exiting corners. It seems to be less of an issue in the RTR but it's running with less power and rear motor is not generally lacking traction on corner exit anyway.
In short put a ball diff in and try it.
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