I have not done much paper tuning. I usually just bare shaft a little weak, and then make small adjustments with fletched shafts. I usually get very good arrow flight. I am going to shoot a longbow this year, and decided to try both ways and see what I came up with. I normally shoot recurves with aluminum arrows, but with the longbow I am making up 3 dozen cedar arrows.
So I found what spine bare shafted well, then I shot it through paper at about 5 yards. It showed stiff, (fletch tear to the right). Not a lot of tail right just about 1/2 inch. So I dropped down 5 lbs in spine, and shot it through paper. Perfect bullet hole. I checked it at 5,10,15 yards, and got a perfect bullet hole every time. This got me to thinking about my other bows. I shot each through the paper, and all were slightly stiff. I have read about people shooting at a point 100 yards away using the tip of the arrow to aim with. Everything that was in line right and left was considered the "right" spine. Everything to the left was too stiff and everything to the right was too weak. I went out and tried this. Come to find out the ones that shot a bullet hole through the paper were the ones that hit inline with the point I was aiming at. The ones that I had bare shaft tested ended up hitting to the left of the point I was aiming at. I have shot the paper tuned arrows at all distances, and am getting great flight. With the bare shaft method I would once in a while get a little wobble. So for me I think I am convinced that paper tuning has its place. Has anyone else tried both ways, and what differences have you seen.