Also, if the check I just ran is right, you may need to move up on your BH weight to get a better FOC. Use the calculator here:
http://home.att.net/%7Esajackson/arrow_ics.html and it may help a little. Just guessing at your exact arrow set-up, I plot you needing a 140gr BH to get a 10% FOC, also this site:
http://home.att.net/%7Esajackson/archery.html , the main site the above link came from has some great easy to use calculators for guestimating. Hope that helps a little.