I can highly recommend John Beauprez, he turned me from a low/mid stakes breakeven player into a midstakes winner at a pretty high winrate about a year ago and still performs regular check ups when needed.

His skype: john.beauprez

He posts here at the high stakes forum usually if you wanna check out some of his posts.

I've also had a couple sessions with John, he was good. With a few pointers I went from breaking even at 50 PLO to beating 200 PLO.