Here's a question just to stimulate some thought among the paper tuners.
If I watch slow motion flight of woodies, especially, there is a fair amount of oscillation going on for a lot more than 6 feet from the bow. If I get the arrow shooting bullet holes at 6 feet, what is it doing at 5 or 10 feet? Doesn't it seem that the point at which there is no tear must be at one of the distances where the arrow is passing through zero flex on its way to flexing the other way? It would also seem to me that a zero-tear distance would exist for a weak or stiff arrow; just a different distance.
Eventually, the fletching will stabilize either a weak or stiff arrow, although it will take longer to stabilize a weak one.
Just food for thought for those of us who aren't busy shooting at the moment