Played that game for years. I'd set em up and mark the ones that were spot on for accuracy. Then I noticed most times it was the ones that weren't exactly lined up fletching to broad head. I'm sure it made not much difference but I eventually figured out it didn't matter if they were a little off or a lot it had to do with the arrow it's self. I had one arrow that had been through two animals and still shot accurate I finally bent it during a practice session and was all sad. Haha. I shot XX78's and have recently gone to a new bow and carbons. But the result using carbons with the fletching lined up with the broad head has been the same for me.