I don't post on here very often anymore, but I wanted to jump in on this thread.
What is going on in your tank looks very much like mine when I was running a super clean tank and had too much light years ago.
I am running a 75G tank now, that I just started up, I have 4x54W T5's about 6 inches off the water's surface, and even those seem to be a bit much for some of my LPS. I measure ~180 par at the sand bed. Fine for SPS, even a little low provided they have enough nutrients but the LPS need some time to get used to it.
My SPS for the most part are coloring up nicely, I'm not thrilled with the growth and may go to 6x54 eventually but I'm waiting to see how things settle in. One thing I have to do right now though is feed allot! The SPS get lighter if I don't. I'm currently feeding the equilivant of 4 cubes of Misys every day, along with a shake of pellet food, and a squirt of oyster eggs, and a squirt of some other coral food. I feed 4 times throughout the day, (one at night, for the coral food) and each feeding time the skimmer is shut down for 45 min after. Apex turns it back on so I don't forget.
Here is how my green slimer is responding from the feeding:
When I got it:
IMG_4950 by
Wiskey2727, on Flickr
About a month later:
IMG_5048 by
Wiskey2727, on Flickr
It's working on encrusting now.
Whiskey