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Dial in by taste

Taste, then change one thing

Keep 20 g in and 40 g out, and change one thing at a time.

Under 25 seconds, thin or sour: grind finer. The manual's own checks are in shots run slow.
Over 30 seconds, harsh or bitter: grind coarser.
Right time but harsh or burnt: owners lower the boiler pressure a little, which cools the brew water.
First shot thin after switching on: give the heated group longer. Whole Latte Love says about 10 minutes; Kaffeemacher measured about 22 to full heat.
Keep the same dose and yield while you taste the change.