Here's an update, I still have 50 ppm borates in my pool.
Sunday, my pool was crystal clear and I had to add a lb of cya, the level had dropped below 30ppm. Sunday evening a storm moved in and I closed the pool cover.
This morning I opened it, to a green pool, after about 60 hours.

no FC, no cya, ph 7.5. I'm so irritated I'm thinking of filling the pool with concrete.
Whatever kind of algae is in my pool is proving to be impossible to eliminate completely. So now, I'm back to square 1, adding bleach in crazy quantities.