PM update...
lost 6 ppm through the day and the ph stayed at 7.2
I took the cl back up to 20 ppm at around 6:00 pm. It's 10:00 pm now and the cl is still at 20 ppm. The water has very little cloudiness, but not quite crystal clear--I'd call it a 95% improvement over 24 hours ago.

I'll post new numbers in the morning.
This is exciting stuff!