My SO4 and Cl get up above 100 when I get my Ca to 50-100ppm. How do you get your SO4 and Cl so low and still keep 50ppm Ca?
My water at home has lots of calcium, but if I had to build from distilled I could put in 1g/gal CaCl and get 72 calcium and 127 Cl. The Cl would be at my high limit but still acceptable to me for this style. Then for this style I would expect about an acidic mash so also add a little baking soda. The sodium IMO will help this style and the bicarbonate will balance the ph.