Something I would like to see you work on is pulling the slack out of the bar for the break.
Based on that video, you are breaking with your hips/leg drive, where as pulling the slack out strongly will a) reduce the ROM by about an inch or two, b) flow into a more powerful break, c) let you get full value from your upper back.
Based on that video, you are breaking with your hips/leg drive, where as pulling the slack out strongly will a) reduce the ROM by about an inch or two, b) flow into a more powerful break, c) let you get full value from your upper back.