I was paper tuning my GT XT and ran into the same problem with the same type of arrow. I had shot 4 different arrows through the paper and 1 out of the 4 would give me the opposite tear of the others. I rotated my nock 180 degrees and got the same tear as the other three arrows. I shoot a TR Drop Zone so fletching contact isnt a problem for me. Looks to me that it was a spine issue, that arrow was weaker on the opposite side than the others and with a little adjustment it was good to go. I re-fletched it so the cock feather would line up with the rest of them and got the DZ tuned to a perfect tear!!! Good luck!!!