I've gone through something similar, but I didn't have the problem on
flat roads. I blamed it on my new tires (I tried 2 different). It
lasted 4 months. Actually I had the problem on my 24" Muni, but not on
my 28" Sun.
Then for some reason the day after I got my Coker, I stopped having the
problem at all. I noticed that I had begun letting the uni angle
against the crown, with my body angled the other way when it got better.
(Might be what helped.)
Good luck resolving the problem.
--
Chrashing - Unicycles are flying machines!
Regards,
Ken
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