All points made are great ones. The most important thing on flight while hunting is the spline, helical, and tuning your broadhead. 1st shooting at a club you will most likely be shooting field tips, spline is not that important with field tips so your arrow should fly fine at the club in your situation. 2nd i too shoot a 27 inch arrow, and shot 70# i would always go with the manufactured listed spline for your arrow, and draw weight, these guys just dont right down number for no reason they know what they are talking about 9 times out of ten. 3rd why change you draw weight alls this does is cost more money in your situation. Shot 62 # and call it good with what you got.. Once you wear out those arrows then think about making money costing changes. Good luck