Yeah.. some servo noise is expected. I can see this if I barely touch a control surface and it trys to force it to that perfect spot with high resolution and could see it in your case for sure with weight being that force. I would not worry about servo noise at all.

It is more like this. I turn everything on. It is sitting there (mine is actually quiet except my standard throttle servo) and I flick the rudder with my finger.. it start to shake back and forth VERY rapidly about 3/4". It will do this until I stop it by touching it or moving the stick... in fact.. Let it go for about 30 seconds one time (timed). I can take it back to center real slow and it will not do it.. flip the stick.. shake.. stop it... flick the rudder itself with my finger.. shake.. touch it to stop. I think that will paint the picture. It looks like it is having a seizure.

To make this happen.. it has to be high throws of 45 degrees or more, no slop, and large control surface (rudder on ucando.60). It I loosen the screw that holds in the servo arm itself.. it will not happen, if I go further out on the horn or further in on the servo arm.. does not happen. If I use it on another control surface.. does not happen.

The fact that a looser connection on the servo arm stops it made me agree with previous posts that I had the servo screws to tight or the hole not big enough. I made the hole quite large and the servo screws where they are not even touching the rubber... still happens. Even if this was the case.. I would consider this a defect. It shouldn't seizure just b/c there is no movement in the servo itself (in my opinion).

I think what is happening is there is a little play in the center of the thing (actually.. i know there is.. I can move some if sitting idle and in its center.. if i move my trims some.. no play at all) and when I flick it.. the servo forces it back to center from the right.. the left turn says.. no.. I want perfect center.. get back over there.. the right flicks it back and so on. I think it has to be a certain weight (large control surface) to be forced into the other side hard enough to get flicked back (but not too much weight b/c it would not get thrown hard enough).. a certain amount of force back in travel (high throws) to give it more speed.. and no movement in the servo (no slop) so that the force back is not absorbed enough to be thrown to the other side.

Kind of like when your wheels on your car are out of balance and you only feel it at certain rpm's of the tires.. just the right force and timing etc.

In my non-expert opinion I think the ds811's (at least the ones I have) have poor potentiometers.. possibly a defect in the ones I have... possibly in their design (hope not design.. I want this thing fixed!!)