RE: Bought the package - Thanks Wyvern!!
if you take off a 100gr field point and screw on a 100gr broadhead, unless the broadhead is substantialy longer than the field point the FOC should not change. Aerodynamics is another issue. If you have a large blade that creates alot of drag and planing you could add more weight to the front of the arrow (heavier broadhead, heavier inserts, etc) and what that will do is make the fletching have more "leverage" to steer the arrow. That is more tuning the arrow to your broadhead, but you will not get the same impact point if your broadheads fly that bad that they need to be "forced" back on target. Once you eliminate that drag with a field point the arrow will go somewhere else... Now adding weight to the bow to make it more "balanced" for you to shoulder is another thing entirely
Wyvern