I've put a second coat on the ceiling and the soffits now. The ceiling looks 100% better but I'm about to start a third coat. The soffits are excellent now that they grey is correct.
I wanted the soffits to be grey but the color I bought, "charcoal", was anything but when my wife put it on the soffits. I bought a gallon of something about two shades lighter than mouse ears and it looks spectacular now.
The soffits sort of emerge from the black ceiling with this subtle gradient now. Exactly what I wanted.
I've also put up two inches of Linacoustic on the screen wall. I really like the improved sound in the room. The room is far from dead but its acoustics have changed dramatically. I don't yet have the sound system hooked up but my wife and son both mentioned how easy it was to talk in the room.
I noticed immediately that the behaviour of slap echo changed. If you clap your hands in the room now the dwell time is far reduced but it is caused almost completely by the left and right walls instead of all four. It's weird. I'm not sure that I like it.
Carpet guy coming tomorrow morning to measure. I'm thinking about having wood installed at both entry ways to reduce wear and tear.