I had both 62" and 64" limbs for a couple ACS risers and shot them side by side for a week, shooting maybe 100 arrows through each per day. Although they performed the same through the chrono, and they hit in the same spot on the target, the longer limbs just felt smoother. I know that it is not a scientific appraisal, but just an opinion. I shoot 30.5" arrows drawn to the point. I had no issues with finger pinch or stacking with the shorter limbs, the longer limbs just felt smoother to me.