Ok to give a complete breakdown of my setup and hopefully what can alleviate temps:

4wd buggy with 6.5t motor with 0 degree can timing
Vtx10BER with I assume no boost/timing, eg I have never entered the "power" part of the settings
Punch 65%
In misc controls forward power set to 90%
Throttle Pwm 12000

I can coming off the track with the motor just over 200 degree's (measured inside the motor through a hole.

I will try adding a couple of fans one to push air on and one to pull it away, but what else can I try on the esc!?

Also, I assume as std all the advanced timing stuff is off/set to minimum already right? I've never used that menu!