Again, the video angle is really probably wrong for me to make this statement, but Im guessing that if you moved the bar more inline with the very bottom of your scapulas (meaning your head would closer to the camera in that shot), and you got your chest a little higher up before the pull you could easily get 20 more lbs just from that. The key would be not letting you hips drop any further.
How tall are you? In the vid you seem a little long legged, is that true? What is your squat PR vs your DL RP
Great work on that pull though! I love it when people pull. I think it is more exciting to watch than the squat.
B-