Question about arrow spine. I have most of my supplies to make 5/16” arrows (tips, broadheads, nocks). I would like to take a 23/64” shaft and barrel the ends down to 5/16”. Here is my question, will this increase or decrease the spine? I have a 50# @ 28” bow. I draw about 29.5” and there is about an extra 3#/inch. I would normally get arrow spines of 55#-60#. Should I stay with this spine or go up (or down)?