How'd you make it tip forwards on the brakes??
I tuned mine (200+BHP), got a nice top speed of about 125MPH...
Admittedly, I have lowered it and stiffened the suspension to improve the handling... I managed to drift it (before I painted it) and got some air like you did.
I raised the suspension fully and then stiffened it which made it tip over easily. It still lacks power even with a full tune so a wheelie isn't as easy.