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The restarted Primula experiment has proven to yield better results. I got black coffee that was remarkably less bitter than yesterday. It lent itself to a cup that required just as much stevia/monk fruit sweetener, but not so much creamer. (I did not want to drink it black, sorry - still a bit too bitter, despite being better than yesterday.)
I must note that Mrs. Capt. found my cup "disgusting." Must be a reaction to the sweetener. We'll try later with Equal.