GRCA,
your case updates are very important to understand whether FP expiry clocks tick from FP done date or service center update date.
After your reply to RFE,
if you get your approval without a 2nd FP, then FP exipry clock ticks from service center update date.
if you get a 2nd FP notice before your approval, then FP expiry clock ticks from the date of FP done.
In anycase, post your updates...
Good luck.