Trans/Pinion/drive shaft angle

[68GMCCustom]

I've had a bear or a time trying to get a vibration my truck has since the rebuild. Its gone from bad to a little less then bad after being all over the map. It busted a pinion ujoint a while back and while it held together enough to limp it home...it was vibrating real bad, limiting speed to 25-30mph or so. Tho I had some measurement errors along the way....its all 3-3.5* now.

All that said, I read something recently that said for high speed vibrations the driveline angle should be dropped from 3* to 1*. I looked under our TBSS and the trans yoke looks to be a few degrees and the pinion looks more like 0*.
My question is, has anyone here had to bring their trans and pinion yoke angles down to 1*? Or close to it?