Hi Jay;
Sounds like you are doing enough, now. However with CYA ~= 100, you might want to take the chlorine a little higher.
Other than that, just stay on course.
However . . . when you get everything fixed, I'd recommend changing timer settings to a minimum (with a sand filter) of 4 + 4 hours spaced at least 6 hours apart. Service guy consensus seems to be that a single run of 4 hours is taking a risk of further problems. I know I would have thrown a hissy fit if any of my customers had tried to do that.
If you want to save more electrical $$'s than that, look into getting the smallest adequate pump in a two speed model, and running on low, except when cleaning.
Ben
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