Sometimes shooting broadheads and field points at the same target and adjusting the rest to make them meet will work. Shoot 2 or 3 fp and 2or3 brdhd at the same target and there will probibly be two groups. The farthest you can consistently group is best. If your brdhds hit left of the fp move the rest to the right and so on. The brdhds steer the arrow so the fp arrow will not be affected as much and eventually the two will shoot in the same spot. You of course have to use the same weight fixed blade heads. This does not work all of the time but it is a method I use often.