Took the car out today after fitting a Tekno 15T pinion and the noise that I mentioned in
my other thread is gone, so it must've been a worn pinion and/or bad mesh.
The 15T pinion definitely calms it down and I'm glad I didn't go to 14T, although I was worried that only one less tooth wouldn't be enough to make a difference to my temp problem. I can tell that it's improved the temps, and the motor and ESC no longer burnt my skin off although the ambient temps are a bit cooler today.
I can run the car at 100% on the transmitter now and it's much more controllable. Definitely not unhappy with my decision to downsize