update on spring flip and pinion angle

well i have things mocked up right now just getting a idea of whats it going to do or be at...and i have a ??? for you on the pinion angle...now i got the mounts done and installed the springs and removed the shims (5deg) to get a base line...i remove the driveshaft to get a good reading.....i sled under as far as i could and put the angle finder on the tail of the trans and got 87deg to the right on the finder and then put it on the rearend where you bolt the ujoint and got 85 deg to the left with the shims out....now i do the math i get +2deg right....so i want somewhere around 5/7 down so i cut the perch off and roll the rear down to - 8/9 im i right????-8/9 will give me a -6/7 if im am right.....i just want to makesure before i do this...i will have pic aswell...oh by the way the car looks good with the way it sits in the back now its about 1" down from before an is sweet...thanks