That's a great idea. I've run my own mail servers since 1999. I'd happily join a union of independent mail operators with the purpose of lobbying Google, Microsoft, and Yahoo to treat us as first-class citizens.
I think you should have a web page where you list your issues, show how you've done all the normal things to be considered a well-behaved mail domain. And then perhaps report your experiences with iinteracting with gmail support on the matter.