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I still have a few bottles so fetching one now. If I live forever I'll let everyone know.

I assumed the other enzymes might need some help as the grain was old, and bromium is supposed to be good at carving up proteins . I thought it was worth seeing if there was any noticible difference. As you referenced cysteine I'm now reading to see what it might actually have done. I steeped...

I had some 3 year old grain (was sealed), did a 1 gallon test with pineapple juice (Bromelain is a cysteine protease that targets the peptide bond inside the protein molecule where they have a cysteine amino acid) brewed ok. Did a 1 gallon test without, better.

Ok - That fits better with the observation. So the wider question is has anyone brewed this with sucess (as in made it drinkable). As the only option seems to be scale it down, or brewing is more art than science.

I got to here from searching keywords. Reading this help with the outcome regarding bitterness. The brewdog recipe https://brewdogrecipes.com/recipes/punk-ipa-2010-current says IBU of 40 - using the recipe calculation and choosing any of the formula for IBU gives something like 98. Brewing...