Hello Issy, just read the whole thread more or less, and saw your website. For this kind of people photography you are practicing I can fully imagine that the Chamonix or any 4x5 camera is working only on your nerves. For this kind of photography I would choose for 6x7 and that with the Pentax 67 mk ii.
I just bought the Chamonix 45F-2 and I love it! But I do real stills, landscape, and abstract studio work with it. For that purpose this camera is not at all anal to me, quite the opposite, it's rather zen. One of the most important features of working with large format for me is the large screen through which I can study elaborately what the lens does with a scene and during this process I get the inspiration to build images in more and other ways than I had in mind at the start. That is totally different from portraits of people in action, which is so interactive that your camera has to be fast.