Awesome. MOTU AES to and from TDIF was your big technical issue and I’m glad you solved it!
Other stuff seems the straightforward usual stuff - more about your routing, use of layers, and your DAW setup.
Levels on meter bridge don’t show in remote layer (its about controlling the DAW, not passing its audio).
There are a bunch of threads about how to set up time code between logic and the 4800 - make sure u are sending MTC to the DM-4800 on the right port (DIN MIDI or USB) and the MIDI:SETUP configuration has it passing thru, and that your System Time Code is set to MTC(MIDI) or MTC(USB), whichever u choose. Make sure you configure the DM’s MIDI, REMOTE, AUTOMATION, METER and OPTION pages correctly, as well as Logic’s MIDI Sync Preferences.
If your input routing from DAW (MOTU’s “From Computer” is set up properly to come in on channels 25-48, playing back in your DAW should show levels on 25-48.