EASTONARCHERY.COM HAS A TUNING MANUAL IN ADOBE FORMAT TO DOWN LOAD.
I BELIVE IN THE GROUP TUNING I HAD ONE OF THE ORINGAL MATTHEWS THAT WOULDNOT PAPER TUNE BUT WOULD ALWAYS HIT WERE YOU AIM....
YOU ARE RIGHT THE BROADHEAD AFFECT THE ARROWS BUT MOST PEOPLE WOULDN'T NOTICE IT AT 25 YARDS IT MORE AT 35-40 THAT THE COUPLE OF % FOC STARTS SHOWING UP....AND THE SPEED....I HAVE HEARD THAT 250 FPS IS ABOUT MAX FOR A FIXED BLADE BROADHEAD, I SUPPOSE THAT WOULD MATTER ON MANUFACTURE.
IF YOU LIKE TO TINKER TINKER AWAY, BUT REMBER WHAT YOU HAVE DONE TO GET IT BACK!!!