The only other thing that I can think of that would cause nock right when you cant the bow would be feather contact with the shelf. If the nock right gets worse the more you cant it sounds like your really getting tail high kick from feathers contacting the shelf. Check your nocking point heigth with a tee square. Then move the nocking point up the string by 1/8″.
The reason I say try this is you could be pushing the limits of allowable clean shaft shooting with the bare shaft, yet once fletched your feathers are making the contact and bouncing the nock up and right.
If this is the correct fix, great. If it’s not, then you will know how much to move the nock back down the string.