I have never paper tuned before and thought I would ask for advice. I just bought the switchback xt. It has a biscuit on it. I thought I could make it better than the way it was setup at the shop, but now I need to fix what I did. So I am paper tuning it.

I am shooting through paper at about 10 feet. I am trying to shoot square with the impact point. I am also trying to have consistent form. I shot about 20 through it last night. I noticed that about 16 of them had the tip down. The other 4 looked like bullet holes. About 3/4 of them had the tip down and right. The remaining were down and left. I figured that down was common to all so I lowered my knock points. The left and right bothered me. What is the common cause for this? Is it my consistency, the biscuit, or my vanes that are being trashed by the biscuit, or something else? I have my arrows numbered, and it didn't seem like it was the same one doing the down left shots. I didn't have time to do another round last night, but I will try tonight.

thanks