As a side note, if it were me with your readings;
I'd dose Ca @ half the recommended for a couple days, and monitor what happens, until I liked what I see
Your Alk is good, and your Mg is close enough ( you know this )
Just try a gentle attempt to balance the Ca some, but, re-test everything after 12-24 hours before you add another dose
What does your NSW test @ after 24 hours of mixing ???
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