I was looking through Cabalas for some carbon arrows for my bow. I will be shooting a Bowtech Equalizer set at 60# and I have a 26.5" draw. They had good reviews on the Extreme Carbon Arrows but they do not give any data on the diameter or spline and do not give a calculator to figure out which arrow to use. They give two sizes to pick from; a 55/70 @8.4 GPI and a 65/80 @ 9.3GPI. I am shooting 100gr field tips and broadheads. These arrows have 4" veins.

My question is which of thesearrows to use andare their better size arrows that would suit this bow to maximize performance?