Awesome win rate, great job. I don't know that it is sustainable... I think that you have to play for a few months before you get a feel for your true win rate. I've only been playing a month though and I've been extremely lucky myself. I have no idea what a real win rate looks like. I've had a run of 33 tourneys with no significant money, and then two days in a row of doubling my bankroll...

Good luck!