Tim,
What a great write up and explanation for the dreaded wobble.
There is that niggling question needing answered but no one seems to able to do so.
Question: Why do some bikes wobble and some do not? Same design and parts, right?
I had a 1994 Ultra that wiggled and wobbled from day 1.
I tore the bike down when it had 48k miles and rebuilt the entire chassis with new parts, then re-alignment.
The bike had exactly the same wiggle and wobble.
That said, I own a 98 RG which has never even hinted at wiggling or wobbling...even when I try to unsettle the chassis in a sweeper at over 90 mph. One finger on the bar to hold the corner and rock solid. That bike now has over 95k miles on it and never once showed any ill-handling behavior.
I owned a 2003 RG that wiggled and wobbled from day one, not as bad as the '94 Ultra, but definitely did not generate confidence in the bike's stability.
My new 2017 RG is as solid as my '98 RG without a hint of the infamous wiggles/weaves/wobbles.
I have a theory but have never been in a position to prove or disprove it.
Bob