ok so i go to easton web page and check there arrow chart and it tells me that i need 2514 shafts ( whichis what i am useing ) either in xx75 or xx78 superslams ..... ok so now i look at there range of arrows and the super slams are now called super slams digital and sized by 300, 320 etc etc so which do i need am i not seeing a conversion chart somewhere ???