Here's an idea
@Dove.
Since you've got all this proof on
@King Martini and as you put it, he's scared of exposure, then why not message him privately to the effect of "Look Kevin, it's enough with the back and forth on the message boards, we have our history, it's over and done now, how about you leave me alone and I'll leave you alone, let's agree to mutually ignore one another on the forums. If you refuse, and if you continue to badmouth me on the forums I'm going to show everyone what I've got on you".
Seems like a really easy solution to an ongoing problem.