If your seeing particulate floating around and see it settled out on the film on the glass then I would suspect buffer problems too. If your mag is high enough... 3x the Calcium or at least 1350 then you should not be getting any clouding. If your alk and ca are high and your mag low then you get can get clouding or calcium buildups forming on glass and magnets. Get a test kit and check your magnesium levels. The only confusing issue is the high alk but low pH. Perhaps your pH meter needs to be cleaned and calibrated.
Are you using Instant Ocean saltmix?
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