Since Straightarrow is playing on the opposite end of norm.

Not saying he is wrong because alot of what he says IS TRUE.For traditional guys I completely agree with his findings but for compounds,20% focmight be a bit of overkill.BUT HE IS NOT WRONG !!!
However,Easton reccomends 10%-15% for hunting.You are right in the middle and if all is good.I wouldn't change it.
I have tested many different FOC for me and 11 % seems to be optimal for me.If I change something.12% might be or 20% might be.

I did test a certain arrow that liked 18%.
Point being,if all is well,don't worry.If you need better fixed head flight,try going up but I wouldn't go down.