Tom C,
I was having a problem with some of my arrows cork screwing close to the bow but straightening out right away. they would hit dead on from 10 yards out to 60 with excelent accuracy. The bow paper tuned perfectly as well.
Then I noticed I was getting some marks on my fletch. I believed the Ultra rest was doing the same thing you are talking about. I then went to a stiffer spine arrow and I haven't seen any marks on the fletch or had any cork screwing issues. I didn't get any extra rests with mine as well.
Can you give me the web site for QAD that you used so I can contact them?
I think the problem may be solved but i would like to talk to them just in case.
Thanks