I think for your goal of turning the pool over to your son with a simplified recipie for your vacation, you're fine. This is based on the fact that you can hold chlorine above minimum with daily dosing.
We'll be glad to help you bring your CYA up a little more and figure out what the black stuff is after you return. The CYA test is the most difficult to read and subjective, I always have a hard time trying to figure out if I see the black dot or the shadow of my head.
Will your son brush the pool for you as well or is that out of the question?
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