I know somebody that fits your description very close. He has been playing high stakes 5000NL, but you can constantly find him at 50NL, 100NL etc.. He just can`t control bankroll management. He has been around for couple of years. Sorry don`t really know what to advise you. I heard there is a coach that focuses on those subjects (tilt control and bankroll mngt), but I can`t remember his name.