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.
Total Hardness, CaCO3 97
Sulfate, SO4-S 9
Bicarbonate, HCO3 72
Total Alkalinity, CaCO3 59