I am shooting 5575. I honestly don't know anything about FOC. If I switch to 100gr. heads would it be better?
IMO yes. The added weight up front will be beneficial.
Also, by going to a little heavier head that would give you a better spined arrow. Right now you arewell onthe stiff side of things.Even with a 100 grain head you are still going to have a stiff arrow.Honestly, I would also try 125 grain heads.