I know that this might sound retarded, but something that I have found to help my mind-muscle connection with my lats is to simply flex them individually while sitting in an arm chair.
I used to find it near impossible to flare my lats (like the BB pose). Then one night when I was reading, I realized that it was super easy to flare them while seated by just applying a little bit of pressure into the armrests. I practiced that for a while (both together and individually) and, soon enough, I could flare them on my own.
Once you can flare your lats hard, it gets a lot easier to feel them working during rows and other pulls. In my experience, developing a solid mind-muscle connection is more important for lats than for any other muscle group, especially for developing width.
I know that this does nothing to address the clicking, but I don't have a clue what that would be. Perhaps someone with more anatomical knowledge will chime in.