IMHO, if the .006 rated arrows actually were straight to .006 over their length, then it would take a very talented archer to "need" anything better. BUT, .003 and even .001 rated arrows aren't usually that good, especially if you are talking about the whole length of the shaft like Arthur needs. The only way to tell is to get a straightener to measure them or at least a spinner to see what they are like for straightness. Yes, when they are not straight, the ends are the worst part, but some are crooked on both ends, some seem dead straight on one end and terrible on the other. Spine is a "whole 'nother issue. I just started measuring spine, but I am seeing close to 10 times the amount of arrow to arrow variation in Carbon Tech Cheetahs (which are supposed to be pretty good) as I am seeing in a dozen ACCs. Does it make much difference when shooting them? Can't say for sure yet, but I plan on finding out.