On the "things to check" list, you might add:
1) Frame bent or twisted
(@ 200 mph, even 1mm out of line can be a problem)
2) Steering bearings knotchy, loose, dry, or worn.
3) triple clamps loose, twisted or bent.
4) Fork legs bent
5) Fork legs have equal oil levels.
6) Front axle straight.
7) Wheel bearings good and well lubricated
eight) Swing arm pivot axle straight and properly tightened.
9) Swing arm pivot axle bearings good and well lubricated
10) Swing arm pivot axle true to the steering head.
11) Swing arm straight and true
12) Rear axle straight and true, properly tightened.
13) Rear wheel bearings good and properly lubricated.
14) BOTH wheels have proper distance tube
between the bearings, and properly installed.
Based on my 40 years of Bonneville experiences, I can
tell you EVERY ONE of the above can be a problem !