Squat Form

Hey, been working on my squat form for some time. Any assistance/critiques would be appreciated. Thanks, link below.
275lbs, 80%, 170 Lb's

https://www.youtube.com/watch?v=M844LTKp6L8

<iframe width="420" height="315" src="https://www.youtube.com/embed/M844LTKp6L8" frameborder="0" allowfullscreen></iframe>