ABM' s comments made me think of something else. Depending on the style of cam on the bow that you shoot you might be able to get away with using a stiffer spined arrow than what is typically found on the charts. Cams that help to store a great deal of energy like most perimeter weighted single cams and harsh drawing dual cams actually need a stiffer spine than what is typically found in most arrow selection charts...or at least that has been my experience.