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I know lack of nutrients this looks more like alk swings. Are you carbon dosing(sugar/vinegar/vodka)?
Also if you are using reef crystals and those are the levels after a water change you may have a bad batch. for me reef crystal mixes at 35ppt with 400-420calcium alkalinity 10-11dkh and 1400-1420 magnesium.
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I suspect that he is mixing his salt way above 1.026 and that is why his calcium and mag readings are so high. I had the same problem with high mag and calcium with red sea coral pro salt, turns out my calibration fluid for my refractometer went bad and I was mixng my water to 1.032. After getting new calibration fluid, my new saltwater mixed within the range that red sea specifies.