Michael - you should be proud, that is an installation many pros would be proud of. Very clean!
One other suggestion would be to try bumping the M80s out from the wall just a bit to allow the rear ports room to do their work. If you're happy with the way it sounds, then don't sweat it, but if you feel like tinkering more some day, you can try them bumped out a bit and see what you think.
Congrats on getting everything set up. It looks awesome.
Good idea. I'll try tinkering with this over the weekend. After I had to move the speakers closer together, I have not done much in the way of experimenting with wall position or toeing them to achieve different effects.