Some good reading on FOC on AT and TradGang.com
This thread started some months ago on AT regarding FOC and arrow weight. There have been quite a few folks, including your truly, who delved into this topic, theoretically and in practice, to see what worked and what didn't. After experimenting some myself and reading what others had found, as well as reading most of the articles on arrow lethality by Dr Ed Ashby, I've come to appreciate what archers in the past and present know about striving for high FOC and heavier arrow weight too. Dr Ashby also has some very enlightening info about broadheads - which ones and types work best.
AT thread on FOC - fairly long but a lot of good info in it.
Links to Dr Ed Ashby's published field test reports. Again, LOTS of very informative data he's compiled over almost 30 years.
2008 Martin Firecat Pro-X (29" DL, 66# DW), home-made TRG, new VEMs, DS Advantage/HHA Pro-5519 front sight, No-Peep Sight Eliminator, Limb-Driver arrow rest, B-Stinger stabilizer/dampener, custom upper STS, G5 Head-Loc quiver on custom mounting bracket. Gold Tip Velocity XT300 arrows with Bi-Delta 2.5" Sharkstooth vanes and Grizzly single-bevel broadheads, 498 grains at 262 fps (22% FOC)