My dream, I really am not understanding what your question is?? There IS no blue zone!!
The only point of confusion I can see is: the problem I was describing with people who thought that there was something magic about BD 7 days, and so they started BD 5 days before O and went thru O+1. Well you can get PREGNANT from BD on O-5 and O-4, so if you haven't had 7-10 days of FR BEFORE the earliest point you can get pg, then that's not FR.
You guys DID that, so you're covered.