u/8cmc

As the title says. Pucks are prepared exactly the same way. Weighed 18 grams with Wacaco, 1 spray of water, grinded with 1zpresson J-ultra, WDT, pressed with the Normcore tamper which makes a click. Extraction for 30 seconds with 93 degrees Celsius. First shot returned 55 grams and tasted better than the second and third which returned 36 grams.

Since the coffee is the same and the puck is prepared the same way, isn't the machine supposed to return the same yields? If not, what am I doing wrong or what do I see wrong?

Thanks!