I copied this from O.L. Adc0ck's website and it has been a tremendous help for me. This chart is for bareshaft tuning or broadhead tuning, which are basically the same thing, just substitute bareshaft for broadhead. It will answer all your questions.
Thanks Double! I am in the process (tonight after work) of building and tuning a set of arrows for my longbow. I cut them last night, nocks are in and need to pick up the inserts today, fletch them and shoot them but not before bareshafting one first. Thanks for the post, pefect timing.