Kawasaki Low Bar Vibration
I recently replaced the original high bars with Kawasaki low bars and Napoleon bar end mirrors. As mentioned before, it was a huge improvement in riding geometry and handling with one exception. More vibration, bordering on uncomfortable. I attribute some of this to the bar end mirrors.
To reduce handlebar vibrations, I went to a local outdoors store and picked up a bottle of "Slinky Maker, 0.300". I'm no fisherman, so I have no idea what this stuff is used for, but it is basically a container full of approximately 1/4" lead balls. Took off a mirror at a time and poured in as many lead balls would fit. The nice thing about these is they are big enough so as not to fall out of the small hole in the center of the handlebars.
Went for a ride yesterday and can say that vibration is greatly reduced, with both mirrors clearer at highway speeds!