Hmm. I'd get away from adding kalkwasser in conjunction with your ato, and I'd probably stop the kalk altogether. You don't need it. I've never used it.
It's too aggressive and hard on pumps.
This may be why your alk is swinging, because it's tied into your ato, which is not consistent.
Separate your ato from everything, remove the kalk, and start testing daily for Alk and Ca. Then you'll see some stabiblity and can move forward with your 2-part additives.
I bet you see stability and your dosing will balance out.
Then set up your doser and you'll be much happier with weekly testing.
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