ORIGINAL: awshucks
I don't know anything about that model. I don't understand why you would want to cut your arrows down to 17", the 20" will be more accurate usually.
Most of Horton's older CB's had a real short power stroke on them. The 20" will work fine and like you say even better. The problem is you have several inches of arrow sticking out way past the front of the CB. So the 17" arrows were alot better for walking around and not getting caught onto stuff.
Muzzys always did great on my old super mag, killed lots of deer with them. The G5 Montech's did good also on the target, but then the entire quiver and arrows where left on the truck one night for the ride home to never make it so they never drew blood.