Keep working on it. Money would be better spent on shocks. Calvert 90/10 and there single adj. Rears and the 002/003 springs. I've done 1.8 60' at 12.9 1.59 with a 12.01 and 1.34 @ 10.36 with only SS springs and shocks. Work the entire car guys. Make everything loose then tighten up the rear...