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Wow great responses. I’m also voting temp is too low. For the beans I like the happy place is around 203.5. I might adjust down as far as 202.5 sometimes, rarely though. And never higher as it starts tasting burned.
I’ll add: could it be the beans? There can be big batch variations. Nasty beans can taste really sour.
Try bringing home known good beans that you’ve seen deliver scrumptious shots.
It sort of sounds to me like something is off with your machine. Maybe time to upgrade to something with a pid?
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