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Rick,
Is the trailing edge moving up and down farther than the leading edge? That is
what I mean by rotation.  What you are feeling in the control stick could be
from the ailerons (rotating) or any of the push rods transmitting engine
vibration through the system.  I had my prop balanced and have the softer mounts
installed, but still have vibration.  All of the rod end bearings will loosen up
over time adding to the slop.  You could weld your control stick in place and
still not arrest the aileron movement, because you can't take all the play out
of each and every bearing in the control system.  When I examined the controls
of the factory planes, I was amazed at how much slop I found.  When my plane was
new everything was nice and tight-no play.  Now my controls feel more like those
I saw in Redmond.  As Pine Pienaar mentioned, the curved skin to which the
counterweights are attached is not stiff enough.  If left as is, the counter
weight will lag behind during accelerations as the material flexes.  Braces are
needed to make sure everything moves together as one mass.  I did try two
slightly different balance points but without any luck.  BTW, I have seen the
same vibration on certified airplanes.  I know the factory has had to replace
hinges on their 360.  I am guessing it is due to this vibration continuously
beating on them.
Good Luck and keep us posted,
Chris Zavatson
N91CZ

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