installed SS springs and pinion angle is at 0

driveshaft angle has little to do with this, its is the relationship between the output shaft of the trans and the input shaft of the yoke. look at a 4X4 with a 30 degree shaft to yoke angle, still goes. like I said, level to the flat valve cover and an angle finder on the diff yoke at ride height, find what you need for 3-5 pinion down from trans output and your done.