@whitepaws Glad you found it helpful!
It was mostly me discovering my own problem, but Armando's book, and several of Jim and Melanie's articles, helped as well.
I think the idea of the Storymind exploring a single problem from different perspectives had me trying to tie all of my throughlines to the same problem. It'd be easier to see, I think, in a tale everyone's already familiar with, so imagine trying to write Little Red Riding Hood as a complete story. If you put OS in Universe and say everyone experiences troubles from the situation of a man-eating wolf on the loose, and then put the MC in Physics and say that Red experiences problems from being hunted by a wolf, then Red really has the same problem everyone else has-that is, there is a man-eating wolf on the loose. Technically, she could be the only one being hunted, but I'm assuming that what makes a man-eating wolf on the loose problematic is that it is hunting people to eat. If you then try to put the Wolf in the IC spot as he plays the role of Grandma, you have once again made the source of the issue to be the man-eating wolf on the loose.
To have four true throughlines from four different perspectives, it really seems that the sources of inequity need to be further separated than that. Figuring out how to make four separate throughlines was just a matter of seeing that in my own work.