The optimal FOC for hunting is from 8% to 12%. The higher the FOC the more the arrow will want to nose dive which increases stability but also decreases effectice range becuase the arrow arcs alot more at longer didtances. There is a suggested min. weight from your bow company for arrow weight, as long as your above that you should be fine.
Hopefully, you haven't cut them or fletched them. That really cuts into your options and ability to tune them to your bow.
Yes, I have cut and fletched them. My front of center is 11.1%.