Personally, if traction is an issue I’d ditch the 3/4 blocks before I did any tuning on shocks or mount locations. And if you need help tuning it, take @GTX JOHN offer to help. You will not find a more experienced racer offering to share knowledge.
Can you elaborate on that? I started without the block and didn't care for the rake of the car and the lack of caster that came with it. I wanted to shim the pinion down a bit so I threw in the block (it's actually a cut down overload spring from a truck, bolted into the pack) at the same time as I installed the shims for a total of 1" more drop. Pinion is now 1.5-2° down from parrallel with the transmission tailshaft. It is my understanding that lowering blocks with Caltracs have much the same affect as raising the front of the bar since they're effectively lowering the rear of the bar relative to the chassis/axle and it should add more hit/bite to the suspension. I can't see it contributing to axle wrap any meaningful amount in this configuration, what would the downside be?