I think you missed what I was really asking.I'm not going to shoot over 60lbs,so my question is would the 60lb bow perform better on 60lbs than the 70lb bow backed down to 70lbs.As far as proper arrow spine I could always back down from 60lbs if needed,but I really belive with all the options of arrow weigh,spine,ect. I could find an arrow that would shoot perfectly through my bow.