"Several of us have also found that there are layers to this FBD thing. I've thought that I was done, at least twice, but I wasn't."
Count me in to this, too. I am 99 % clear at the moment.
But; it may have to have something to do with the season; I am possibly better at summertime, and worse in the winter.
It took over 6 months of IO supplementing for me to notice considerable effect on my FBD.