I wish I could help... I'm sure you've gone over this in your own mind hundreds of times.
You're right, I don't see anything deadly in those water parameters. Not listed are: SpG, Temperature...but I'm sure you have those in control.
That leaves me with Lighting, Flow, some sort of element deficiency, or some sort of toxic contaminant/bacterial/viral agent.
None of this has been helpful to you at all...sorry.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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