recently i purchase a super nice Anderson longbow, the Skookum,70 #r, all my arrows were going left,worked spine,still left,call fred anderson himself,thinking the shelf required a softer spine, and he reminded me to keep my elbow directly in line with the draw line,i.e.with the arrow and forearm, following his advice,i found that my form had indeed been off,now i drop them in the spot every time,well every time i have my form right that is. but certainly a huge and therefore remarkable improvement.