I am setting up a Firecat with XR limbs, I need to change the draw length, the Flite wheels it has on it are the 2.5" 31" draw. His draw lenght is aprox. 28-27.5" What can I do to get this changed over, I assume i need to get new strings and cables and new wheels, or can I switch it out with a different cam system? The cheepest way the better obviously, he just had a kid and cant affoard to much. Any help would be much appreciated.