I started a thread asking about this FOC yesterday, not this one. Since then I put in at least 4 hours testing various set ups with my 3 longbows. I have found what Bill C just said is spot on. I love the flight of these set ups, beautiful and true. My groups of 3 are easier to obtain, seem to hit hard and beautiful to watch. The gpp is about 12 on 2 set ups at 28", probably a little more since I draw slightly less. The third is at about 10.5 gpp with a 17.5% FOC, the other 2, 22.6% and 20.6%. The lighter set up is perceptably faster and flatter. I feel more confident now than ever having spent the time tuning these set ups. It will be a long hard wait to experience the tuning in a hunting situation. Now to work on the broadheads for scary sharp. This is fun, no doubt love the journey.