Happy to report that it seems like tires were the issue. I think I may still upgrade the joints in the axle to johnny joints because at $75 a piece, might as well. After messing with caster a bit I might drop it back from 6 to 5.5 or 5 since I have a slight drive line vibe still. First time I have gone over 50mph in months.
So another question, I will be switching to 35s (sitting in the garage) once I swap my 9 inch in soon. What's the consensus on balancing beads? I have a buddy who runs them on his 39s and loves them, but I have never used them personally or dealt with them in the tire shop as they are not exactly corporate kosher.
CounterAct or balancing beads, may and may not work!
I have only used them in tires that were 38" and taller, they did an ok job on those.
35" tires should be able to be weight balanced as long as the person knows what they are doing.