Ok @ 31" max poundage should be 61lb.I have a downloaded version of the shaft selector.If you cut just 1" off they are proper for your range of 60-65lb.Shorter arrows are stiffer.The acc 3/39's would be a better choice to me.I would stick with the 85gr head.As far as left helical for lefties,that's a new one to me.Hope I helped.