I look at it this way:
If my end goal is to have my hunting arrow with a broadhead and fletching tuned as perfectly as possible, that is what I’ll tune, my hunting arrow. I’ll do this by shooting at a distance, for me this is at least 30-40 yards, and I’ll adjust until my arrow recovers and flies straight down range to my target. Once you have the hunting arrow tuned to fly straight downrange at a distance, changing to a similar weight small game head or field point will shoot to the same POI because they are more forgiving than the big broadhead.
I’m not a big believer in attempting to tune your hunting arrow with broadhead and fletching by replacing the broadhead with a field point and removing the fletching ,and then tuning based on the results of a fletchless field point arrow. When your done, you’d have your bare shaft perfectly tuned for no feathers and a field point, but when you add feathers you’ll be changing the dynamic spine, and when you replace the field point with a broadhead, you’ll be changing the dynamic spine further. In the end, you’d still need to confirm and retune by shooting your hunting arrow with broadhead and feathers at a distance because with bare shafting alone, you’ll probably be off with your hunting arrow as the broadhead is not as forgiving as a field point.
DB