Not entirelely clear what the issue was, but it is solved. Set the User EDID when the projector was on HDR content (set manually), copied the EDID as per manual, powered off AVR and extender, and it all works fine. Should stick through power outages but may not if someone messes with the extender's EDID settings button. If that happens, repeat above. The extender "learns" the projectgor's capabilities via this process and everything syncs up with power resets.
Kudos to first rate tech support from AVPro Edge. Nice to see a tech company in South Dakota. No way I could pull fiber from AVR to projector and the image is superb, so thankful they have this tech.
Kudos to first rate tech support from AVPro Edge. Nice to see a tech company in South Dakota. No way I could pull fiber from AVR to projector and the image is superb, so thankful they have this tech.