The burning bush has filled in nicely after the initial styling. The leaves have become so dense that light is not getting into the inner core of the tree.
Since the tree is growing so vigorously, I decided to remove the other branches which I don’t intend to keep. (I originally kept these around because I was afraid the tree wouldn’t survive the drastic initial styling.)
The gradual lowering of the main branch using the guy wire has also appear to have paid off. The lower main branch is looking more perpendicular than before.