Originally posted by Fleatrap1: Am I missing something. I am still very much a beginner to the art of trad archery. I shoot 3555 30" length shafts with 125 field tips and 135 zwicky broadheads. I also have 5 gpi weight tubes inside loading the arrow up to around 530+ grains. I shoot a 45# super grizzly with a 27" draw. I am getting great results from these arrows! They fly like darts, group well and punch a single bullet hole through paper fletched or unfletched. I keep reading that most people would load up their 3555 with a lot of front weight, but when I try that the arrow gets squirrelly real fast and performance goes away! Are the weight tubes changing the dynamic spine of my arrows? I haven't tried pulling them out to test, but then again if things are going good should I even bother???