Any progress photos of growth after that cut back pruning?
What would you estimate is the trunk diameter?
Melbourne is pretty far south in Florida for Ulmus americana. They may have some difficulties there.
Looking at your tree again and I had another thought. I would consider cutting back a little more even (later on after new growth pops perhaps). I imagine that you wouldn't want the outline of the canopy to be much bigger than this now and you're going to need a little space for ramification and taper on your branches.