I think I found the 1 thing the MMP can't do....
Tamyia mini racing is moving to 21.5 motors. Blinky mode of course.
The hot motor right now is the revetech with ~76* of static timing. The cars have a fixed gearing and the motors get ~120* after 10min.
The MMP will spin up to a 'native' rpm and then after 1-2 seconds it grabs the timing and spins up more. But sometimes it doesn't
I've tried the 3-4 MMPs that I have laying around, all do the same thing.
My old GTB has no issues with this.