I also have a QAD Ultra rest and A Bow Tech Pro 40 dually. I ran into the same problem with not enough centre shot. I contacted Ultra Rest & they advised me that they had a new model out which had a longer launcher bar which should work fine with my bow. They mailed me the new rest with the longer bar and I sent my old one back. Needless to say, there still wasn't enough centre shot adjustment. Since I loved my old Ultra Rest on my Mathews which I traded for the Bow Tech I made my own spacer out of aluminum to install between the rest and mounting bracket. This then gave me the cntre shot adjustment which I needed.