I shoot bow poundages from 50 to 58lbs I struggled for several years trying to find a carbon arrow that flew perfect. for some crazy reason I put a 100 grain insert into a 3555 goldtip and I was shooting 175 tips and WOW that thing flew like they say "a dart" I did some experminting and found the CE Heritage did the same these arrows are cut to 30 inches, I did a check on Stu"s Calc and found the goldtips dynamic spine was 32lbs and the CE was 35lbs, what!! this could not be true, but they flew like I have never seen a carbon fly b4, So I have found my arrow and I am glad others are using weaker shafts and getting good results, I believe it to be another discovery about carbon. they recover so quickly from paradox that It appears you can use a supposedly weaker shaft and get good results ..BTW the goldtips weigh in at 535 grains and the CE 620 so these are not lightweight arrows at all,, good hunting weights