what are you guys running for pinion angle? is there a specific degree that takes away the vibration?

 

The pinion angle being the difference between the trans output and the diff input I measured mine on the ground before to be -1.75° I replicated this by shaving one side of the flip kit saddle bracket and rotating the axle until I had the same -1.75° pinion angle with the suspension loaded, no vibration no shims