For those shooting fingers or off a shelf, springy or something like that it's much more critical as it all has to do with spine. You already impart archers paradox and have to tune for the best flight. If you're shooting off a fall away with a string loop and release, you can shoot a much larger variation of arrow length, head weight, spine etc and get away with it.If you can tune them, shoot good bullet holes with broadheads and field points and have them hitting the same place you can shoot a broom handle if you want to. I too have my arrows aboout an inch longer if not more than they need to be. I too was looking for a few extra grains and a quieter bow. Shooting a release, fall away and a loop I can put just about any head on and do just fine.