OK 1 hour later and I'm caught up on your horror story. WOW this has been going on too long. I commend your efforts.
I'm not sure at this point I would trust your Nitrate monitor. With the algae issues you had it clearly indecated you had an issue. I'm wondering if there is just too much nutrients in the water. I think you have addresses alot of it by checking your TDS out of your RO/DI but what is still in your tank? I'm sorry I might have misses it but are you running Phosphate remover?
I know your running Carbon. Another think I read and wanted to share.
When cleaning your filter socks. I use baking soda it gets them really clean + if there is anything left it will just add alittle temporary ALK boost.
Looking at the pictures of the SPS it appears the biggest symptom of desater is the loss if the slime coat. I resently experienced this and found a combination of low Alk and high SG was the cause.
Sorry I know it's late in the game and I maybe repeating other comments.
J
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