@starkey480 suggested I bump the pinion up 1* over the driveshaft. I made those adjustments today. Pinion at 10.1 and driveshaft at 9.2. Vibes are almost dialed out. I got up to 74mph before I thought I might be feeling some vibes. I may have a few more adjustments to make, but I think I can get this solved without another $$$ dump. Then I can focus on the XJ and tire size for the TJ. Goin' to 35's, yes or no? I don't know yet.
I also took a look at my MML (Motor Mount Lift) in relation to the bracket on the passenger side. I have
@mrblaine to thank for pointing that out a long time ago, but it just came back to mind and I thought to take a look. It looked like it was clearing, but it was very close and looked like it had touched and rubbed some. I worked an angle grinder and cut off wheel up over the lower control arm and trimmed some for additional clearance. There are less vibes in the cab overall, and the rig is running smoother overall for sure. Every little bit makes a difference as the nuances are worked out.