I think you are overthinking the vibration. I ballpark my pinion angle all the time and even on skinnies and slicks I don't have any vibration. The only time I've had any type of real vibration was after 120, but at that speed it's impossiblt to not expect vibration in these cars. I'd bet your driveshaft or tires are probably out of balance.
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Vinnie -
00 SS A4- LQ9/LS3/Stalled/3.42s 1.48/11.10/121 mph<-6spd swap in progress.
13 Silverado Z71- Sold 11/16
99 Z28 M6- -H/C/9in - sold 1/13
99 Silverado Z71- The DD - Sold 7/13
03 CBR 600RR - Sold 8/13
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