My ability to avoid being choked from rear mount has morphed into an inability to escape rear mount.
Here's a blog post that includes a clip of Gustavo Machado showing a few different ways for dealing with rear mount.
I've gotten into a bad habit of not sticking with technical strategies against rear mount, and instead have been essentially flailing away. Defending, sure. But wasting a lot of energy and not getting anywhere. I'm not taking guard passing from the top of the August Book. But making my counters to the rear mount automatic will be a very, very close second.