RE: SPINE LOSS CAUSES
Len, though I am not an expert in bow setup and tuning, I thank you for your post supporting paper tuning.
I like to tinker and paper tuning is most important to me.
I also like to bare shaft tune -back to about 20 yards. (You must be sure you are not torqueing the bow in order to use this method).
I find if I can get my bare shaft on a good straight flight, I can get all my shots - with the fletched arrow (field points and broadheads) -grouping together.
Whats your feeling on tuning with a bare shaft?