So I took some 4' field fencing and cut a couple lengths of it, 6'3" long. Bent these into half pipe shape, and connected them by their ends to make a soda can shape that's both four feet tall and exactly four feet in diameter.
I put one of my RDWC tubs under each side, hung the cylinder from the ceiling, and now I have plenty of room for plants. I said, and I meant PLENTY- each of those four by six and a quarter panels is 25ft², making each little four foot square cylinder the proud owner of fifty full square feet of trellis space.
Hang your thouie vertically in the middle of this cylinder, use your UC underneath and I'll bet you can beat even the numbers you've been putting up.
This won't work in the greenhouse; it's designed to take advantage of artificial light's specific properties indoors.
Pics; these girls aren't finished, but the system is so good I didn't want to wait to tell people;