With the equinox I'd use a slightly heavier arrow. I make my own. My personal choice is Gold Tip Lazer II with 110 gr insert and 2" Blazer vanes, tipped with 125 gr Slick Trick Magnum. This will give you an arrow weighing about 430 grs, with 20% FOC. But there are lots of great arrows on the market currently Easton makes great arrows. Parkers Red Hot arrows are made with built in FOC.