You seem knowledgeable in this area. I am slightly obsessed with this stuff ever since reading The Goal. Where can I learn more? For example, how can we use variability to create more profit? What are high-capacity queues?
In terms of resources, Will Larson's An Elegant Puzzle hits on some of these themes and is very readable. However, he doesn't show much of his work, as it were. It's more like a series of blog posts, whereas Reinertsen's book is more like a textbook. You could also just read a queuing theory textbook and try to generalize from it (and that's where you'll read plenty about high-capacity queues, for example).