But how do you get your FOC % higher without loosing some speed? Right now I am shooting a 30" arrow with 3 vanes, a lightweight plastic nok, and a 100gn tip. Shooting ICS 400's. My draw is 29.5" and I get 270 fps out of this set up. Are there different arrows that would yeild a better fos? Right no, according to http://lmariana.wso.net/foc.htm, my fos is 7.98%. Any help for the peretually ignorant would be appreciated.