I really think your on to something David, but for the opposite reasons. Blue would be the UV protectant color for that coral, usually bright blues, pinks, purples and reds are the defining colors. My reason for thinking this especially in your case is the reviews that Ive heard from users of the 24" 'rs, out of all the lengths these are the most bright and intense speaking in terms of ratio of output/bulb length. Not only are you banging the light output, but you have top notch reflectors which makes you pretty elite on PAR values. But on top of all that you have a fairly shallow tank, AND on top of that you have your corals pretty high up in the tank(that is not very deep).
Was very similar for me when I first tryin different configs and I was more concerned with PAR than spectrum. Any coral that had blue normally was sky baby blue in my tank. So, I took the GE out. Helped big time, but the greens were still somewhat elusive, then I took another "day" bulb out and put the Tru 03 in there. Major help. So, now I feel I have the spectrum dialed in, it's come to my attention that theres still room to beef up my output, which I agree. That's where I start adding in some Ice Cap reflectors. I still am running cheap individual reflectors that are not true parabolic reflectors, so I beleive that will be the ticket for me personally. But if theres anything you saw of mine that you liked or thought looked a lil better, less light would be the reason. Thats of course everything else was pretty similar like water chem, flow, filtration.