I've never had adverse impacts from magneisum in my system and I keep my levels as high as yours is now. Remember people with briopsis doing magneisum treatments keep their levels higher then what you've stated with you adverse effects.
Anyways to answer your question you have two options; wait it out or water changes. Essentially you are waiting for you system to use up the available Mg. A word of caution with the water change method though, if your salt is high in Mg you're not going to be getting the results you hoped for.
Sounds like your torch and bubble coral are just miffed and laying off the dosing for a few days will probably bring them right back out. Additionally my question to you would be how are you sure that the retraction of two LPS corals are a direct link to high Mg? I'm just playing the devil's advocate here.
Good luck.
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