Second batch using Bru'n Water today. Both 100% Weyermann Pilsner and Jever (boiled) profile. Bru'n Water predicts pH 5.40, both mashes just under 5.3. What can I do to dial this in in the future?
My first thought on anything like this has to do with confidence in measurement.
Are you sure your measurement was correct? Quality instrument, representative sample, calibration, Positive there is no mistake in your volumes, grains, lovibond, spreadsheet #'s, etc.
Secondarily, is this a consistent event - brew 3 beers with similar water/grain/additions - do you always come in at the same range? If so, I just adjust accordingly.
Personally, I find my dark beers coming in lower than projected pH.... So, I have just learned to compensate and now get consistent numbers where I want them.