Try doing some bent over rows and if you can't keep correct form (its very hard if new to you)
or you get no resuts from them, try doing them on a smth machine.
Also, intead of cable rows with 2 arms, do one at a time so you can concentrae on (squeezing the back muscle)
more than you do with doing rows arms. It works.
Also, lat pulldowns with strict strict form. Lower the weight and do more reps.
On the cables rows, if you do continue to to use 2 arms, do drop sets meaning
something like this 180-10reps than bring weight down 20% to bang out 6 -8 more reps
than down %20 more and rep it out till failure. All this with no rest between sets and do
but before you do the drop sets, do 2 regular sets to get you're body warmed up.
Bent over rows or t'bar rows are essential of malimum browth in the back.