I couldn't agree more with Ruth here. If your livestock is showing no signs of distress, I would do it this way until all your levels are where you want them. My system uses controlled evaporation to adjust the amount of Kalk I dose daily, but eventually it ends up Magnesium deficient like yours, and Calcium and Alk are hard to maintain once your Magnesium goes under 1000pm.
I would liken it to pouring your Ca+ and Alk supplements down a drain if they are precipitating to where Mag is supposed to be. The Randy Holmes Farley article posted is about as explanatory as it gets too... I would do water changes with extra Mag in the water and once these levels get back up to 1250 - 1300 ppm I am almost certain your Alk and Ca problems will go away.
One other thing - getting your S.G. up to 1.025 from where you are at should take your Calcium concentration up around 20ppm due to the extra dissolved salts in the water. Your dKH may be a little higher because of this as well.
As for making your water the right levels... I use Kent Osmo-Prep Marine with my RO/DI water and Instant Ocean salt. After mixing, Calcium is right around 400ppm and Alk is at 8-9 dKH. Maybe try this before you change salts?
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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