mate, i know you, so fully support your videos, but i've rowed for a few years now, and your technique is fine, but it's not perfect. leg drive comes well before any movement of the back. you then need some back swing, which you're lacking atm. think of your body moving from 11-1 on a clock. then...
is the actual video for 11.12-11.15 available by any chance? this is 11.09 onwards