I'm running no front sway bar, run 90/10 shocks, and have boxed uppers/lowers with air bags. At the track I can do a short burnout, launch at 5psi and see 1.65 short times. However, on the street, the car doesn't hook at all. If i punch it from an idle, it'll start spinning once the boost hits. I tried brake-boosting it to about 5 inches of vacuum and it just spins even worse.
If switching to 295/55's on 15x10's will improve the traction on the street, I'd go that route in a second. But me thinks that the rear-end geometry is what's hurting my street launching since there is just no weight transfer occurring.