Hey All,
Follow up on this. I never was able to figure out why the full img wouldn't boot. But I followed the instructions to extend the partition on the img with no roms and everything seems to be working fine now.
Sorry for asking this if it's already been addressed. I've been trying for a couple weeks to figure it out and finally am gonna just ask for help. I can't seem to get the full image to write properly. It writes successfully with win32 disk imager. With Etcher there will be a verification error...