Billy Goat
WKR
Interesting. My assumption was that I had a wonky or untuned arrow. Over the weekend I had new strings put on and the bow was tuned for me and I haven’t seen the corkscrew since. But your comment has piqued my interest - what would be out of tune to cause the corkscrew?
You shoot bare shaft to find the spine?
I use to shoot bareshafts, rotate the nock so I got the exact same impact, then fletch for that orientation.
Now I just fletch and shoot, rotate till they all hit the same hole(hooter shooter allows me to cheat). Gillingham has a method of shooting through paper, rotating the nock until all arrows react the same coming out of the bow. Seems it would work.
A whisker biscuit will make an arrow act weird because of the contact. It's way easier to get a bullet hole with through paper because it puts drag on the back of the shaft as it clears the bow, but doesn't mean everything is correct.
Corkscrewing arrow is the back of the arrow not following the point, or an odd vane color giving the appearance, but likely the back of the arrow whipping around. Can be caused by contact, weak spine, really poor form, centershot being way, way off.
I'd get rid of the illuminated nocks. They usually don't fit the string very well at all. Only ones that I have seen that I would use are Firenock, otherwise they are all junk in my opinion. The nock is where your arrow makes the most contact with the bow, and where consistency is important.