I see your tight hammies are fucking with your entire movement.
Work on scapular retraction, as well as maintaining a tight lower back throughout the movement (squats mostly).
However, it’s going to be incredibly difficult to fix the situation unless you increase flexibility in your hammies.
Your lack of tightness in the upper back is putting a lot of stress on your cervical spine. I’m gonna assume you experience some tightness in the neck/traps.
With that said, beautiful speed on the deads. It looks like you have 315lbs on there and you pick it up easily. Your strength is there, try focusing strictly on mobility and watch your lift go up even higher.