First, at what distance are you shooting those bare shaft tuning shots? If it’s relatively close try moving back and see what it shows. Another thing you have need to watch for (especially with the full length shafts) is getting a false strong spine reaction, resulting from the arrow’s rear striking the riser.

I don’t pay any attention to nock kick during bare shaft tuning on my EFOC/UEFOC arrows but once your arrow is tuned, and assuming that you’re shooting into a target that is uniform (like a REALTIVELY NEW foam target), you won’t have any left-right nock kick.

Ed