Sorry, I wasn't clear in my post. I wasn't using distilled water for this brew, I was using my tap water, treated with campden, and with the addition of 2g of partially dissolved chalk.
Like I said, this water report is a few months old at this point. Maybe it is that my water is highly variable. I dunno.
pH 7.5
Na 15
K 2
Ca 27
Mg 7
Total Hardness, CaCO3 97
Nitrate 1.2
Sulfate, SO4-S 9
Cl 26
Bicarbonate, HCO3 72
Total Alkalinity, CaCO3 59