The angle isnt changed by the location of either centerline by height location. How are pinion angle and rear end angle different? Still dont see how you come up that +2 and -2 end up at 3. If your numbers are correct (+2, -2) you should have 0 static driveshaft angle. This would result in an undesirable + angle under load. A vibration on decell is generally due to much - angle as the pinion drives towards the ground. It appears that the yoke seems to be pretty far out at the trans. There may be the cause.
Doug