Believe it or notI only have one over my 65g Tank. It's been that way for over 5 months now and I have no complaints. I switched all the optics out to 70* which is very simple and cheap $20. I was growing SPS directly under it but I slacked on my water change and my green birds nest no likely. i mainly have LPS, and softies dominated. SPS is just too much work for me. As far as LPS my Acan that is only 4 months old went from 4 heads not to 11 heads, my frogspawn that is 7 months old is forming a second head and same with my hammer which is only 4 months old. Zoa's are growing out of control I had 2 frags with 1 polyp each that are only 3-4 months old, now one has 10 other has 11 polyps. Light is 11" AWL, 85% peak intensities on both colors, and the pic is before I installed 70* optics
Here is a pic to see how I hung it. Very simple Bracket from home depot, framing wires and the metal crimps they sell in the same isle.
I like the way you hung it directly from the mounting rail screw eliminating the need for the rail worked great for your application.