I am shooting Carbon Express XP Selects (6075) at 27" with a 125 gr head, FOBS, and wraps out of a 72 lb Ross Cardiac with a 27" draw. I have downloaded the trial version of OT2 shaft selecter software, which says this combination is slightly on the stiff side. However, broadheads hit a few inches right of FPs at 40 yards and no amount of rest adjusting will change it. I have successfully walkback tuned with broadheads and they seem to fly well, but they wont group with the field tip arrows, always to the right. In spite of what OT2 says doesnt this suggest a weak spine? I am thinking of trying GT 7595s at 27". OT2 indicates that this shaft would be very stiff, but that shaft is recommended by the GT charts. Anybody have any suggestions? Thanks.