I also have persimmon trees and have been trying to work pears, rabbit-eye blueberries, peaches, mulberries, chestnuts and other things into a very mixed setting. Not as a commercial orchard, but as a personal homestead on about five acres. The wax myrtles that I have all grow wild as understory growth, mostly around pines. I've chopped and dropped branches from them often but usually try to not chop them back too severely. I've often wondered if they were nitrogen fixers but only recently did any research, not knowing what they were called, for sure. My mulberries are mostly for feeding the rabbits and are very young trees that I intend to keep cut back. I like the sound of what you're doing but the mulberry trees do get big and spread out. I can see where they could get overly greedy about canopy space. (Maybe my wax myrtles are only understory plants because a mower didn't get them, being amongst bigger trees, come to think of it.) I like the idea of interplanting both wm and mulberries with orchard trees, with the idea of chopping them back frequently since my attempts to get mimosa trees going haven't had time to work. I'm between Albany and Moultrie. I can't offer advice, just liked your post and wanted to respond. None of my trees are really productive yet. Few pears and fewer persimmons from young trees.