Things are pretty much exactly the same, and I'm beginning to wonder if the discoloration I see really is algae at all. If it weren't for the one set of overnight results showing 1.5-2.0ppm drop, I'd say it was just some kind of greasy mark that got dust/pollen/something stuck to it. Whatever it is, it does not brush off -- kind of like the residue from a sticker or something, where the only way you get it off is to bear-down with your finger and smear it into oblivion.
Regardless, I kept the FC up all day Friday, yesterday, and today, even letting it go to 25 and 26ppm. We had a lot of sun yesterday, so there was a time between 1:30 and 4:00 when it dropped to 22 and 23ppm -- but other than that, it's been at 25 or 26. Overnight test showed 1ppm loss, from 26 to 25ppm. The pH got to about 8 yesterday as I didn't treat it Friday or Saturday. I brought that back to 7.6 Saturday evening. CC has been holding at less than .5, TA 130, CH 210, CYA 55/60.
Took a last reading at 5:00pm, got FC of 24ppm (down 1ppm from 1:00pm), and I went ahead and shocked it again to 26ppm. Water has been crystal clear, bright, and looking so good you wanna cry that you can't get into it. Thoughts? Should I continue this through tomorrow? Go ahead and call our pool guy and ask him what he thinks it may be?