Since we are in this subject, I have a question too. I shoot 60 lbs. with the 5575 shaft. I have hard times with arrow flight being the same. I mean, I would have couples flying ok, then others not grouping the same at all. When I am looking at their chart, I should be shooting 3555. But on the product page, the 3555 said 35-55 lbs and the 5575 is 55-75 lbs. Which shaft should I be shooting instead? My arrow is 25" long with 100 grains head. Thanks for any inputs.