Drag racing is always a crap shoot. If you can't launch your times are going to stink. The 5.0 is actually really tough to get down the track because it's under tired. On the Brembo cars you have 255 width Pirellis all around that spin spin spin with just about every shift, so it's really easy to go slow with the car if you are too aggressive with your right foot.
The car needs
at least a 275 width rear.