I Like Paper tuning the best of all of the methods. I always say that the paper does not lie. However, you have to draw the bow to the same place every time and have a decent release for it to work right.
If you are not seeing a difference in your tear, you may not have the paper tight. Also, you need to start out 3-6 feet from the paper. I start around 4 1/2 feet from the paper, and after I am tuned at that distance, I check it at 10 yards. I am sure that this is not the only way to do it, but it is how that I do it.
If you start with a tuned arrow (an arrow that produces a perfect tear), and add weight to the front; you make the arrow weak and it will produce a left hand tear (nock end of the arrow will tear to the left of where the point entered the paper) If you take weight away from a tuned arrow, then you make the arrow stiff and it will produce a right hand tear.
Good luck!