How consistent are the 60 fts? If they are real close, your shock settings might be very close. If they are all over the place, like more than .01 or .02 apart, then due to the SS springs I would start at full tight on extension and see if it hooks at the hit. You need video to watch, and go frame by frame to see what is happening. If it hooks well at the hit but spins later, you might still not have enough shock control for the high leverage of the SS springs. If it spins, then hooks, start loosening them.
What does the rear shackle angle and length look like? If they are long, and angled at a 45 degree angle toward the rear, they will really increase the separation at the hit.