I've always been a fan of chins, but found that a lot of the stress went to my inner back, where I guess I was naturally stronger (not a bad thing, but contest bodybuilding is about correcting imbalances). Not that my lats were lagging, but I realized that I needed to thicken them up to create a better 'X' Frame effect when standing onstage. About a year ago I started incorporating close grip (usually a v-grip) pulldowns where I would maintain a perfectly upright torso position, while keeping my elbows in front of my body the entire time (none of that 'squeeze your shoulder blades for a peak contraction' stuff), while pausing the motion when my hands reached in front of my chin. This allowed me to put much more direct stress on my actual Lats, which I believe made a very big difference in my physique.
Also, and I think I've been asked about this before,.. I never was a fan of wide grip chins, pulldowns, anything, simply because my naturally dominant arms took the brunt of the work. Instead, I've always relied on scapular retractions in a cable station, and focused on more of an angled-shrug if you will.
These are really the only exercises I incorporate that have me doing work in the vertical plane.