I can make a set of perfectly matched arrows, one or two will always be disappointment.
I have tried to recut the nock taper to get them to fly right but nothing works.
I was shooting the other day and was shooting consistently high and left. I only shoot one arrow, retrieve it and shoot again. I was thinking I was having a really bad day then decided to change arrows, bingo! I was back to being spot on again.
If I can't tame an errant arrow, off it goes to my ever expanding dead arrow pile.