The day I finally checked my espresso machine's brew pressure after 3 years

I kept getting these bitter shots but blamed the beans or my tamping, then a customer handed me a pressure gauge and said my machine was likely running too high. Turns out it was pushing 11 bars instead of 9, and after adjusting it to the right range the difference was night and day. Has anyone else found a basic maintenance check that completely shifted how their coffee tastes?

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