Dave! Glad to see you're still around. No PAR readings. It's kind of moot as the lighting I've got, is what I'm using. Not planning on going from 250s to 400s. If you go back through the thread you'll see where the halides are on pulleys that raise and lower them. My 180 had the lights about 8 inches off of the water. Now they are about 1-2" off of the water, so I'm sure I'm helping my penetration. Heat has not been an issue.
The rock at its highest point in the back right corner is just higher than the halfway point with reference to depth.
The method/madness. The rock pile is shaped like a wedge from right to left and front to back. The water flow is s gyre, where the ENTIRE body of water rolls over the top of the rocks down towards the front and back up the back side of the tank. It gives the appearance of less flow, as there are not power heads blasting pinpoint areas. Overall, IMO there is a larger amount of flow.
Having achieved huge SPS colonies in my last tank, I feel confident I can replicate it. The selection and placement of frags is such that they will fill in, maintaining the wedge shaped reef. But it will still only get up to about 3/4 of the depth of the tank at the back right corner. I want a big reef but in a huge body of water with lots of swimming room.