Who has the most accurate arrow selecton guide that takes into consideration most all factors that effect spine? I have OT2 but I always like to cross reference the info with another source to verify, plus some of the info in OT2 does'nt seem right. For instance; my wifes Parker buck shot shoots @ 215 fps thru the chronograph. The OT2 program says it should shoot @ 145 fps. Big difference there so I'm not sure if its giving me the correct suggested spine either. Carbon Express website has a good chart but it doesn't take into consideration her short (24") draw length. I guess what I need to know is this. If manufacturers use a standard draw length to determine the correct spine, how do you adjust for draw lengths shorter or longer?