Flywalker, There is no way you're shooting the same arrows only in a stiffer spine and heavier shaft and shooting faster. Sorry, just not possible, however, you may find that the arrows ARE shooting far more consistent, and it's resulting in much better flight. Not sure where the "fine tuning of sights" get you however. If that bow is paper-tuned, and you zero a pin, at 20yds, then do a walkback shooting from 15 - 20 - 25 - 30 - 35 - 40 yds, and see if you have a pattern that looks like this " / " or this " \ " , or this " l " . Once you're pattern looks like the LAST one, then you'll know you have the rest "roughly" centered. Once you've achieved that screw on some BH's, spin test them and make sure they spine nice and true, and BH tune the bow.... See link.... http://www.archerytalk.com/vb/showthread.php?t=539460&highlight=broad+head+tuing This is probably the EASIEST step by step pictorial you could possibly find, and it's gotten over 115,000 views on AT for VERY good reason!!!
I figure that because they are stiffer that the arrow is not flexing as much therefor it picked up speed. It was not much speed but I had to move my pins up when readjusting my sights.
