What is out of wack here??

I have a 29 gallon BioCube - 9 month old tank. LPS and softies - normal bio load What is going on with my levels??

Salinity - 1.026 refractometer
Temp 78 deg.
PH 8.0 - Instant Ocean - new
Calcium 540 - 560 Nutrafin / Hagen - new
DKH 11 - 12 - Nutrafin / Hagen - new


Why are my calcium and alkalinity so high? I am getting ready to move to a new tank and am getting back in the habit of testing... this has blown me away... I haven't tested magnesium yet (too cheap for salifert test kits) but... would that being out of norms throw my calcium and KH that far north of the norms?
 
Do you dose? Before I did SPS, I never dosed with a full LPS and softie tank. I just did lots of water changes with quality water.
 
I do a 25% / 5 gallon water change about every 10 days. I am not on a dosing scheudle. I add iodine for the Xenia.
 
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