Psuedo-update on the Denon HDMI issue:
I tried creating a custom EDID as well using an EDID emulator, but don't feel like experimenting enough tonight to see if it will work - haven't even set it up correctly enough to get a picture through yet.
One thing I noticed is that the dropouts during jogging only happen in some apps. Vudu, for instance, is designed in such a way that, for whatever reason, it switches video modes when you go from play -> jog -> play. Prime Video, Netflix, and Youtube don't do this. So it's possible that an app update could at least alleviate the problem. I'm ok with a 5s delay when starting/stopping a movie (annoying for Youtube though) but not every time you skip/rewind. Some apps on some devices are going to be better at this. We'll see.
Another thing I noticed is that each time this dropout happens there is a faint click from the AVR. So it's doing something, but lord knows what. Maybe if we can figure that out we can get closer to eliminating the issue...