Thanks for the input guys, the setup was a direct transfer from a similar sized profile, that's had well over 100 flights without issue, which is why I'm pointing the finger at cooling.
The setup was a turnigy SK3 35-36 1050kw, 4S 3000mah pack, and a 45 amp speed controller. Prop was an 11x5.5.
In hindsight I had the idea a turbo backplate may not be pushing air into the motor, but actually drawing air into the spinner and ejecting it out the prop blade holes, (centrifugal pump basically). I think I may have short circuited the airflow, going directly from nose scoop to prop holes, and bypassing the motor altogether.
In all honesty, I was never really happy with the chip, it has some issues. My partner thinks it's cursed, and has suggested I build a new one and leave the chip is wall art. I'm half inclined to agree!