Here is the thread on bar weights that you may be interested in.
The conclusion was that the iso's should be adjusted to minimise the vibes at the speed where the problem is. Above about 3000k everything should smooth out.
Posted: Sun Jul 02, 2006 1:36 pm Post subject: Hanslwbar vibrations
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Yes I know Commandos are vibe free above 4k. Great but I am always stuck behind some plonkerat 50 MPH in a horrible vibration patch round 2600 to 3100 RPM which becomes painful. I have tried all sorts of wacky schemes but now made a pair of the heaviest possible bar end weights.
(Thread continues for 3 pages) do a search on "Hanslwbar vibrations"
Hope this helps