Moogie - I forgot to mention one other photography "trick"...and that is manually playing with the lighting intensities on the Grafik Eye to balance out the output. For example, the tiny LED lights you used at the side of your columns don't really put off that much light, but in your picture they look like flame throwers because of the exposure times. It will take some trial and error, but if you work the exposure zone by zone and dim as-needed, you could end up with some very good and interesting shots.
And now that I am thinking about it, there is one other tip - never underestimate the value of accessory lighting, spotlamps, reflectors, etc. to be used out of frame. I have seen photographers use a downward facing spotlamp with shudders so the carpet could be highlighted a bit more vs. being in the shadows. So there is a certain amount of artistry to getting the perfect photograph for sure. A spot meter would also help you dial in your exposure times, f-stops, etc. for the manual modes of your DSLR. Perhaps you have a knowledgeable friend who has this equipment that you can borrow for a weekend to experiment.
And I can't believe I didn't mention this in my first post (and first on your thread incidentally) but amazing job on your theater. Going from a pile of dirt buried under the house filled with HVAC ducts to a world-class media room is a great rags-to-rich story and a testament to your unbelievable book of knowledge and craftsmanship in the execution. If my theater ends up being 1/10th of yours in the end I think I will be doing cartwheels. I am just thankful that your theater is built and documented so I can learn from your experience. Although I thought I was a fairly knowledgeable perfectionist with a Type A personality, after reading your thread I now know that I am the equivalent of a lazy and uneducated slob with a severe case of ADHD!!!
Just one more home theater itch to scratch with those lightboxes.....