Would it be a bad call if I did close it improperly on purpose to let the CYA break down? Would the chlorine demand just be to clean up the algae bloom or are there other risks to consider? If this will lower the CYA how would one close improperly - just put the cover on without adding bleach?

Regarding the metals the last owner did a bunch to clear that up, but I haven't looked at that and I don't have the results around from my test but the last time the previous owner had it tested Copper, Iron, Manganese were all listed as "0" or "no" - since then I've added probably 4-5 inches back to the pool as well as drained some with some of the heavy rains we had here in July/August. Seeing as the house has an iron filter I'm guessing I added some iron to my pool.....

In looking at the tests from the previous owner....it's Interesting that CYA went from 35 to 65 to 88 from May 14th to June 14th (tested every 2 weeks)...also a note on this paper about phosphates being high....