Well, after 3 hours or so on the line with Netgear, another 2 hours of my own troubleshooting, and another 45 minutes with Fios support, I have a solution.
The netgear guy called me back and had me update the firmware on the Orbi.
That was it.
Nothing else required.
The 6 or 7 Netgear people I spoke to before this guy told me not to worry about the firmware. Lesson learned.
Everything works perfectly. the Fios speed is so good going through the G1100, I'm just going to leave it connected. Thanks everyone for your help.