To the Op, does it always come out of the burn out with the rear hanging out to the left? If it does it in different lanes at different tracks you could put a turn in the drivers torsion bar. Without scales it is an indication the rear weights are unequal under load. I have found a little adjustment will go a long way. I would also check to see if the front shocks are topping out. It looks like the nose either tops out sharply or the tire spins and drops the nose quickly. Shock tuning. Also I know guy who runs an AFX car who said the best suspension mod he ever did was a BIG aftermarket rear sway bar.