The first thing that jumps out at me is that your magnesium levels are low. I would try and get that up to 1350 - 1400 (over time of course but you already know that). That could very well be what is causing your other levels to be out of whack.
If it were me I think I would be just tempted to stop dosing Kalk altogether for a while - stop adding any kind of buffer and just do larger water changes - like maybe 40% every 4 or 5 days and see if this does not bring everything back into balance. Is there any chance that you got a bad bucket of salt? Have you tried to measure what levels your fresh mixed change water is?
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