Is the wobble only experienced at high speeds? And what is considered high-speed: highway speed or racing speed?
Has anyone encountered it at low speeds? I have encountered a "wobble" where the handle bars/wheel rock back and forth with increaing intensity until I grab hold firmly and/or accelerate. I have encountered it more than once on 2 different bikes at low speeds while decelerating in gear while I had very little or no pressure on the handle bars. The first time was on an 86 SuperGlide years ago when slowing down for a light and adjusting my glasses with both hands. I have also experienced it on my GoldWing at low and high-speeds.
I think the low speed wobble is also what killed Indian larry.

Of course he was standing on the back, so he had no chance to regain control.
Is this the same wobble? I have no resolution, just an observation that it has occured on other bikes.