Do you have any friends who have been racing stick cars for a while? If so maybe have them take it and see if it can be powershifted. I have been told before a car won't do it, only to then go and do it in that car. Once you know it can, you can work on it and get it right. I see low low 12s with some hard driving!
and yours has a whole loet less for motor. i think theres still alot left in the coupe man. send 25th down the track in it! lol.
3rd video of yours. to me it looks lik eyou pulled the wheel!