Andy,
I think your virtual of this tree as a cascade is daring and "thinking outside the box."
Seriously, one thing that would definitely improve this tree is spreading the nebari. It seems to go straight down into the pot. How deep is your pot and how deeply is the tree planted?
I like the second trunk formed of aerial roots, if I am seeing that correctly. Now if your roots were buttressed a bit farther from the trunk, you'd be well on your way to showing a very natural banyan style tree.
You might also work on refining the foliage masses. When you get in to work on this tree, defoliation is also good to see where you are going while working.
One reason I think this tree is a question mark for you, is that the movement or flow of the tree is ambivalent. If the tree moves to the right, the left branches are too heavy, and vice versa. I'd like to see this tree wired out. I'm not such a big fan of guy wires, especially for trees that take regular wiring as well as ficus do.
I would really like to see pics of this tree from all angles, too, especially if it were mostly defoliated. Great work so far.
Chris