Tru-Shot has hit the nail right on the head ,The Liberty is a great bow when it comes to smoothness but your short draw length I think it would work against you since you said that speed is a factor .I shoot the /dually and I have a Cosmic sight as well and my bow shoot's very flat from the seped and arrow combination. The Cosmic will likely be my hunting sight and my Spott Hogg Real Deal will be my 3D rig. I'd go with the Pat since the Draw is much better than most bow's and you'll most likely find it an improvement to begin with.

nubo