Help! I need help selecting a wood shaft spine for my Longbow. it is a 66" 60# @ 26" "timberline" hill style longbow by pete george. i shoot 27" long (nock to back of point) arrows and 190 grain grizzly broadheads. i have never been satisfied with my arrow flight and would like some advice. i am not sure of the spine of my present mixmatched set of arrows. any help would be appreciated.