I am having pretty good luck. I built a lot of structure at varying heights and keep the SPS in the upper sections and the LPS in the lower sections. I found it really useful to rent a PAR meter early on and I dialed my lights such that the upper reaches hit the lower level of SPS needs and the low-mid are well suited for LPS. The PAR meter really helps you understand what you're working with. Also helps to choose less picky, lower light tolerant SPS. I have some easier ones such as birds nest and stylophora that are growing like crazy, and some trickier ones that are living but growing REALLY slowly. In my opinion, you could use some more vertical in your structure to support some SPS up higher. Again, the PAR meter really helps you understand the significant differences in your tank at different depths and distance from lights horizontally (if you have any spots).
Here's a recent pic of my tank illustrating how I have it laid out. The bad illustrations at the top are representing that I have two LED spot lights at the top which create a hot spot in the middle suitable for some SPS. It falls off around the edges so I have some LPS up high on the sides or back corners but the middle is my SPS zone.