Right now I'm shooting between 55-60lbs pull on my bow and getting around 226fps with my arrows. I'm shooting GT hunter expeditions at 8.2 grains per inch. When I go on the calculator no matter if I raise my tip weight, draw weight or what I do I seem to get the best KE with this weight arrow. Anywhere from 50-75 lbs of pull 8.2gpi is giving me the best numbers. I've read that heavier arrows penetrate better, but can't seem to prove this out with the KE numbers. I'm shooting 5575s right now, is there a better arrow combination or is the 8.2gpi going to be my magic number. Also my GF is shooting the jazz arrows, and some easton nugent arrows and getting around 175-185fps and around 22ftlbs of KE. I have no idea what the grains per inch of the jazz arrows are but if anyone knows and or could make a better recomendation than those or the nuges for her 50lbs pull and 24" dl I would be thankfull. I don't quite understand all these numbers and the easton bow charts are kinda hard to figure out. Thanks to any and all who may be able to assist me in this.