1). Form is inconsistent and consequently, so is the drive, and 2). you are very short at the front end/catch.
Regarding being short at the front end, you need more compression of the legs. Your shins should be vertical at the catch +/- 5 degrees. Additionally, you could use a little more body swing forward on some of your strokes. Good rule for body swing is 11 o'clock front-end to 1:00 to 1:30 back-end
As to the form, I see little ticks in the drive that vary stroke to stroke. Do some rowing with eyes closed 10 to 20 strokes at a time. On some eyes-closed sets focus on your body being smooth and connected and on other sets focus on the handle being smooth and powerful through out.
Your back and leg drive connection is OK, and will improve with a longer front end and better form. (Don't worry too much about whether you are driving legs and back consecutively or concurrently, there are world on the water champions in both camps).
On the plus, you have generally good engagement; your former foray into rowing shows.
I am attaching two videos -- they are erging on Coffey SimulatOars, not C2s, but the rowers are ex-world champions are rowing really well:
http://coffeycorporation.com/SimulatOAR_S2TI.html (scroll down the page for the videos)
The girl, Olivia Coffey, won a World Championship in the W4x in 2015. She is hammering. The slow motion is revealing. Great engagement. You will note that at the catch she drives primarily with her legs, but she is also opening up with her back
https://vimeo.com/77082313
The guy is Robert Dreher. He won a gold medal in the 1990 World Championship in the Men's lightweight 2x. Note the leg compression, the ease, the power and the efficiency.