Traction problems

I run Caltracs and Calvert Racing adjustable rear shocks and 90/10 front shocks. At the track I have been running MT ET Streets in a P255/60R15 and never spin until the 5th or 6th run when the track is getting sloppy. On the street I went no Nitto NT555R Extreme Drag radials in P275/60R15 and they hook up so well on the street I am going to run them at the track this year. Not sure why you aren't hooking up. I push 500hp and 528 torque and can spin them at will, just not at the track with the stick em down.