What draw weight and what length do you intend to shoot them at? The only difference between the 22's and 22 Pro's is the straightness. If you plan on cutting them down then cut about 1 1/2" from the nock end first. Cut the remainder from the point end. You'll end up with a straighter arrow.

I shoot the Pro 22's simply because I was a shooter for GT and they kept giving me Pro's when I could have shot regular 22 shafts, as I cut them down to 27" anyway. Hey, their pretty good shafts, too.