Very thankful for the info in this forum. Just got my green card. Some info:
EB2 NIW
PD 2005 4 8
RD 2005 4 18
AD 2010 1 28
Two fingerprints, numerous EAD applications. This January our PD was current AGAIN, so I contacted our district congressman who had been bothered by me several years whenever my PD became current. Don't know if this helped. Anyway the gay works with Congressman did ask USCIS for our case.
To everybody who are waiting for, don't give up and try everything you could and finally it will be your turns.
Good luck.