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If you finished the video and still are wondering how this might help, the answer is simple: time matters more than you might think. If you notice a small adjustment finer results in a much longer shot time than a tick more coarse, you are at the point of no return. Go coarser. This should help you traverse the "sour/bitter" area quite well.
I hope this helps those who have issues dialing in their espresso!
Looking for the data? Here you go!
https://shorturl.at/OqX2S
Looking for the original paper with the volcano effect? Look no further!
https://www.cell.com/matter/fulltext/S2590-2385(19)30410-2
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