Do more back work?
..Nahh, but seriously. Good Teres development(all things relative) and I can see you deadlift. It looks like you pull with your arms when you do your pulldowns. I could be wrong, but judging from lever length and overdevelopment of certain muscles and underdevelopment of other it looks like your bicep dominant. I can also tell you deadlift.
Try placing your hands a bit closer together and imagine pulling with your elbows. Even better straight from the humerus.
Do close grip pulldowns. neutral grip.
Straight arm pullovers from a high cable pulley.
...And of course no back is complete with out all kinds of pullup variations.The more, the better,, LOTS AND LOTS of pullup variations.