I agree with dvw. You need to soften the hit to the tire a bit with the shock. If you can't you need to move the bar up 1 notch.

You didn't say what ET your car runs so it's hard to say if a 1.42 is a good 60ft, but at only 3,000 lbs I would think you should be in the mid 1.3's even if you are in the low 10's.