I'm actually fine with 2012 R2, it's just the migration was a royal pain. Now that things have settled down, I'm in a much better place. After I made the post, I turned on the logging and rebooted the machine. I didn't login and check to see if the warnings persisted. My new cables came in, so I rerouted all of the cables with fancy new locking ones, so maybe that will help.
I'll keep an eye out for that specific message but it looks like it's subsided for the time being.