In your setup push your knees out harder after you bring your shins to the bar. Also make sure the bar stays on your shins right as it breaks off the floor. It looks like right as the bar breaks from the floor it moves forward about a half inch. I can't really tell from the video if that's because your not pulling back on the bar to keep it tight to your body (my hunch) or your standing too close to the bar. Post another form check next time you deadlift after implementing these suggestions.