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Personally, I have found that one arm dumbell rows have worked my lats well for a good taper. I perform 10 reps for 2-3 weeks, 6-8 reps for 2-3 weeks then some at 12-15 reps, also alternating reps speed too has helped with my back, i.e 1 second lift 3 seconds down, or 2 seconds lift and 4 seconds down (this hurts) instead of the usuall speed you work at.

That said I dont just do dumbell rows, I change my routine/exercises every 2-3 weeks. Some good ones though are seated cable rows, various pulldowns/pull ups.

Although as everyone knows your muscles will be stimulated by different movements than other people so give your back (and other muscle groups) a change every 2-3 weeks and find out what makes you hurt/grow the most

J