RE: Arrow straightness, how big of a difference is there?
.006 for most should be just fine.
I am a perfectionist when it comes to set up. I won' t go over .003, and prefer .0015 NOT that I am SO grea that I can tell the differance...but it helps me " tune the archer" When I KNOW my arrows/bow are NOT to blame, any misses get blamed on ME! If you don' t question your equipment, you know there is only one part of the " trilogy" left to tune.