I only had the front springs clamped next time i will try lower air pressure if i don't get better tires.
Only reason I suggest low psi is because I assuming you have a d or e rated tire and the compound is harder and the sidewall is stiffer. They suck for racing. Haha. Mine r E rated and they r horrible. But at like 25psi and leaving with like 8psi boost it hooked great. Good luck on the hunt for 12