This is the biggest problem with paper tuning, or any sort of tuning to be honest. It is only as good you shoot to begin with. Many will shoot through paper chasing tears all over the place until they are ready to pull their hair out. When in reality there is nothing wrong with the bow, they just don't shoot consistent enough to tune effecitively.

I don't even bother tuning a bow for a new archer. I set everything so the arrow is coming out straight with no contact and leave the bow alone. Form is much more important than worryng about tune. Once they learn to shoot consistently, then we can worry about tuning. You can shoot amazingly well with an out of tune bow and field tipped arrows with good fletchings.

Number your arrows and see if the same arrows do the same thing every time. If not then it is your grip or form. It doesn't get much simpler than that.

If you are paper tuning and don't get consistent tears DON'T adjust anything! That's my advice anyway. If the bow is not set right it will put a tear in the paper, but it should do it consitently. If you get one arrow that goes up, then the next goes down or to the right chances are it is not the bow. I would either look at the arrows or the person pulling the string.

And yes, coming to full draw and digging the nock and the release into your face can cause problem since you will not do it the same way every time. It will induce archers paradox just like shooting with fingers. At full draw everything should be comfortable, relaxed and lightly touching.

My opinions anyway.

Paul