This is my process as well.
I have found that if you bare shafts or broadheads flying fine the other will too.
Same as well.
Bare shafts can kick your ass sometimes, in a good way. It’s a good way to dial in your tune AND make sure your form/grip is consistent.
Erratics tears will tell you your form needs work. To me, this is just as important as getting the arrow flight perfect.