Tasting this again now, and it's not good
The harsh bitterness has gone, it just tastes of S-04. Nothing interesting in this at all. Also think I was batch sparging too hot perhaps as there is a haze, or though perhaps the outside variable temperature storage may have done this. Also doubled the necessary CRS for a bitter 'cos I didn't know what I was treating then, and used ph5.2.
Boring beer, but think it's my fault

It's another lesson, or more hopefully an explanation as to how guessing technique is worse than leaving well alone.