What exercises do you do to bring them out? Looks like over head stretches like pull ups and dumbbell rows similar to how the famous Nautilus machine works.
By far the easiest and most useful exercise for lower lats, if it is done right way. High seat, pull the leavers quite down at your sides, near to hips. Stretch as far as you reach, and when pulling, pull your shoulders back and squeeze your shoulder plates together and hold couple of seconds. Use versa-gripps etc. to maintain your grip, keep sure that you don't need to bent your elbow over 90-95°, use as much weight you need for reach failure just before 20th rep, and you will feel it right there..

Just about right posture and angle at the elbow for squeeze at the end of the pull, just hold it there few seconds. By this you prevent using your biceps, and get all benefit for lower lats. It isn't about the weight, everything is about the feeling in the muscle, and by getting it, you are able to lift more and more. This is usually my fourth exercise for the back, I do heavier exercises first, but I still need ~100lb per hand to get all out with this row, before I end with seated cable row..