hi everyone. i shoot 50 pound long bow & 27" draw lenght. i beem shooting for about 7 mounths. i shoot 19/16 wiyhweight tubes with 125 tip total weight 525 grains. they shoot very well. i bear shot them & they go right with the fletched shaft. but some people say they are under spine. i have tryed heaver arrow spin but did not shot the same, your thorghts. thank you & have a great day.