Jake, HA! I was right on at least 2 things - I'm not the 'go to'guy here and, as I said, I may be way off! So there!
Sorry, I really thought I had a good possible solution, unfortunately, your pool doesn't agree with, an otherwise excellent, assesment. I'll keep my eye on this and if none of the real 'go to' guys answer, I'll pm them and try to get you their oppinion. As I said, I gave it my best, good luck with finding the cause and solution.