I bare shaft at 20 yards. What I am looking for is an arrow that flies like it would with fletching - nice, pretty and straight. I don't vary my tips - I stay at 125 grains for simple reasons that a lot of braodheads are at that weight. Start with a full length shaft, and shoot. If it flies nock right, its too stiff in spine. Only adding weight up front will weaken it, so at that point I'd change shafts. When the shafts fly nock left, thats a weak shaft, and I start cutting 1/2" off the shaft until I hit a length that the arrow flies straight.

Theres too much arrow paradox off the shelf of a recurve/longbow to shoot paper

and I disagree that you can tune an arrow that is flecthed. The fletching corret the errors in the spine by stablizing the shaft.

Bigbear53 - remove the flecthing from your "tuned" shafts and I bet they'll fly sideways !