Cable pullovers allow for a great stretch and full contraction of the lats. The added benefit of having your entire back supported by lying on the ground lets you focus on volume without the fatigue accrued by supporting yourself.
Remember, big lifts first, then do this low-stress finisher for added volume.
There are plenty of ways to ratchet up the intensity of a set, like forced reps, Tom Platz iso-holds, and rest/pause sets, but you need to apply them in two-week waves.