Well i am posting here now with hopes of some replies. I recently purchased a Hoyt Alphamax 35, cranked to a scaled 72#, 29.5" DL, 30" 2317 XX78's with 125 gr. tips (total weight 586 gr.). I love the setup but i believe theres more to be had than the 248 FPS im getting now. I have been playing with this thing for two weeks now, scouring the forums looking for a easy answer only to find out there isnt one. I shot the 2317s with good results out of my previos bow but this Hoyt doesnt like them as much. On paper tune they indicate a weak spine (2317s have a 300). I have been looking through Eastons web site and found there Shaft Selector SW but it just tells me i need 2317s as well? I started to look through there charts and found that a 2315 has a stiffer spine (340). Could i try these without fear of hurting the bow or myself or are they too light as indicated by the Easton software? I like the idea of loosing a little weight and gaining a little flatter trajectory without sacrificing too much of the kinetic energy i have now. Any help would be greatly appreciated