How has your back been?
I know you were having some discomfort a while back with pumps or soreness.
Also noticed it looks (from that vid angle anyway) that you use some foot flare on your pulls.
Have you noticed, or tried a pull with your feet more straight forward? Since the reason I ask is, when I use more foot flare, I do feel a bit of it in my low back.
I think one can get more lockout power with flare, but less off the floor and vice versa.