Good explanation, Pappy.
Here's sumpin else that may be of use to some re bareshaft testing.
I shoot at a BIG "can't miss" target because a bareshaft arrow can sometimes go really wonky on ya and try to fly into left/right field ..... beginning your bareshaft testing at 6-7 yd shooting distance is good advice. As ya get arrows seeming to fly straight at 6-7 yd, move back to 10-12 yd and observe. When arrow shooting straight at 10-12, move back to 15. I stop at 15. Some folk go back to 20.
Another reason for BIG target is so ya can concentrate on watching arrow's flight, rather than focusing on hitting a spot. I don't completely trust how shaft is stuck in target to tell me degree of left/right nock. Instead, I watch how it flies. Reason is because my targets tend to be too shot up to trust how shaft sticks outta target.
Last, shoot an arrow multiple times before deciding how it's flying. Release can really affect bareshaft flight, so ya don't want to make decisions based on just one shot.
Oh, yeah ...... here's Kool Aid color chart for the feather dyeing.
http://www.dyeyouryarn.com/kool-aid.html