I have no such problems with mine on the shorter stroke cams even the longer stroke cams it just a bit of vibration but this was solved by using my 30mm steel grips. slight bend at the solder and further up the bar and one elastic band (i have the spektra bands) and the harder grommets that i always use. I have never needed to go over 9v but have just ran it at 10v and still no problems wether give or no give (i personally never use give apart from a quarter of a turn for lining).

From what you have said there doesn't seem to be anything unusual about the way you set it up (but do try the steel grips if you can and keep to a max of 9v) so maybe theres an issue with the machine itself as the give knob is not staying still?