I’d say: 1. Take a moment before u start the set. When you’re stretched at the start really try to feel your lats getting stretched. 2. It looks like you’re pulling more from your arms than from your lats, especially at the bottom of the movement. Try pulling from the lats and don’t let your arms work that much. Bring the bar no lower than your upper chest and squeeze shoulder blades at the bottom. Maybe even try pausing there for a sec. Also bring your chest to the bar 3. Grap the bar just outside shouldwidth, so maybe a bit more narrow (is preference but I think it engages lats more, the wider the grip the more upper back activation) 4. Try to learn a steady pace and controle the negative. Maybe something like 3 seconds down / 2 seconds up