Granted perfect 0 degree phasing would be ideal. But if the phasing was causing the issue it would vibrate on accell as well. Shaking on decell sounds like the pinion is to far down. That being said your angles dont add up. Trans down 2 at the rear. axle up 2 at the nose is zero. Where do you get the 3 degree pinion angle from? What am I missing?
Doug