I would revisit the tyre and make sure it has not gone out of round and slightly egg shaped by spinning it while on the full stand.
Start it up and pop it into gear then look from the back to see of it goes up and down.
I had that but didn't notice the first time I checked it. Then I did the all balls and brace route, and it was still there.
Turned out I had broken belts, they get progressively worse as they break 1 at a time and radiate out from the first damaged belt.
Clear as mud? Real easy to do and doesn't take long at all.
The number of threads that result in the rear tyre causing problems with the rider feeling it in the bars is amazing.
2009 GL1800 8A / Triumph Scrambler 900. Ridden where the geography includes glaciers, fiords, mountains, plains, subtropical forest, volcanic plateau, and miles of coastline are all within easy reach of each.