Since you're shooting tight groups with both, it's obviously not your form. I was having a similar problem earlier this summer. I downloaded the tuning guide from Easton's web site. It's actually pretty simple to get your broadheads and field points grouping in the same spot. That eliminates the need to adjust your sight for one or the other. Rack-Attack is right on the money. You just need to move your nock down or your rest up in VERY small increments until both broadheads and field points will impact at the same spot. For more info visit the Easton site and download the tuning guide.