Good points Damascus dave. I buy my arrows close to the spine I think I'll need, cut them to the length I want, glue on the field point or broadhead I want, fletch them and go shoot. I rarely have bad arrow flight. If so, I'll tinker with point weight a bit, or perhaps the bow's side plate. Almost never need to mess with brace height or nocking point. Been doing it that way with woodies for more than 50 years. It works just as well with carbons. All this tuning to the nth degree is rather silly, IMO. Very few of us can shoot well enough to get accurate readings/tell the difference. That's one of the reasons its frustrating for a lot of folks.