Tim - jumping your arrow weight by200 grains will make a pretty hefty difference, buddy. Your 20 yard mark will definitely move. Also, your other marks will move too - so you can't just move the whole bracket. Your pin gaps will get wider.

Make sure you don't just move your whole sight bar and zero your top pinat 20 yards and leave everything else set as it was. Very important.

You'll have to re-sight it in at every different yardage marking.