After a month of slow driving, my LHS spent two hours looking over my car...it was the ESC! A GT7, programmed at minimal throttle. After resetting it to full throttle We then discovered that it had no brakes. After all that, I ended up having to buy a new one. $140 later, I now have full throttle AND brakes. It wasn't the diffs, bearings, or batteries. I wish now that I had checked the ESC way earlier. But at least I'm back in the game.