I've been playing with additions. Normally I run mine on the low side. I pushed it, for me, in a recent beer. I suspect I found out what too much CaSO4 is for me. The beer is an English IPA ish beer. I don't claim to be an expert in the style by any means. The thing I believe to be too much SO4 is a strange mineral dry thing that is mid palate. It similar to papery oxidation but not it, just throwing that out there as the most similar I can think of. Oddly, the last sip from the glass (warmed) the odd mid palate thing in lessened.
It's a 1.060 all Golden Promise, mashed low, bittered around 40 ibu with Challenger, then 50g each of EKG, Fuggles and Target 5min and dry hopped with the same. 1028 at 65f. Closed transfer (Crystal clear) to a properly purged keg. Conditioned one week in the kegerator. Water is distilled with minimal Mg, Na, and 200ppm SO4 from CaSO4. All calcium comes from gypsum, all Cl came from 2g of NaCl. The most SO4 I have used in the past was an American IPA, with 150ppm SO4.
Other than that the beer is quite nice. Any thoughts? Am I right? Did I just find my personal limit for SO4?