Jim,

If I add 1 oz at the rudder, that means much more in the nose to keep the plane balanced. So this I will not do because whatI hate above all is to add weight to an airplane.
I will try the plane with a stiffer mechanical link and will get rid of the slack.
If this does not cure the snaking then I will live with it. I will not fly in turbulent air.
Thanks for your ideas, its always interesting to discuss the issues, even if we don't solve them.

-Paul