I used to be a "weighted chins for wings" dude, but lately i have come to re-appreciate lat pulldowns to front with medium grip.
The key is not to move the torso to avoid momentum and really squeeze the lats until the bar touches the upper chest.
A nice twist is to do 8 strict reps front pulldown and/or when you can no longer let the bar touch the chest, u change immediately change your grip to close reverse grip and crank out another 6 reps.....
Also I think dumbell rows are a must for every back workout.
And T-bar I think is one of the most underestimated lat builders around (everybody is jumping on the bent row train since yates , and for some good reasons but i feel it's primarely a upper back beefer) T-bars really hit the lower and middle lats. Problem is most ego trainees put on heavy weight and do them allmost standing upright to move that kind of weight. No, keep bent over and steady and put SMALL plates on the barbell to have a greater range of motion