I'll tell you how I did my test. I put the car on the track and it felt like it was boosting everywhere in the infield, and the motor came off at 200F with very mild settings and conservative gearing. When I picked it up off the ground and barely blipped the throttle, it sounded like it was immediately boosting. So I recalibrated the ESC/radio and it sounded "normal" when doing the throttle test. It also felt like you'd expect on the track. However, it reverted to its previous problems once the ESC was turned off/on.

It seems to me like the same problem irgo is describing.