I'm very low tech on my tuning methods for my hunting longbow. To me, it's a hunting arrow and the most important thing is broadhead flight. I do not see how anyone can reliably predict the effect a broadhead will have on a shaft that was tuned using a field point and no feathers. I can see this bareshaft tuning being valid if you intend to shoot field points, but I don't see its validity if you are ending up w/ a broadhead and big feathers.
I start w/ the hunting head I intend to use for the game I seek, I choose the biggest feathers I can get away with, I choose a shaft that gives me the strength and weight I'm striving for, and I try to choose a spine that gives me room to remove length until I reach a point the arrow goes around my handle and flies straight down range. When I reach this point, I know this arrow will shoot field points equally well.
Daddy Bear