Ken,
I'm not actually concerned about the KH, pH and calcium because, considering the number of water changes I've been doing its no surprize that I've stripped away calcium and carbonate.
My MO for dropping the salinity from 1.032 to was to change 5 to 10 gallons of water every day or two and replace it with 1.010 brackish water. Not alot of salt in that so the calcium and KH will have to come back up slowly. I had just added buffer before I checked so the pH didn't surprise me.