An Easton Axis .500s will work fine. Ultra small diameter holds the center of the arrow closer to the shelf to help the bow accommodate a little more spine and the skinny shaft increases penetration. Can front load the end to tune the arrow to the bow.
In fact, will want to front load it some with a 50-100 grain brass insert to give the arrow some weight. A 50 grain insert, 20 grain aluminum adaptor and 125 grain point will give you an arrow in the 480 grain range, just about perfect for your set up IMO.