My honest take: if your coffee tastes bitter or sour and you’ve already dialed in your ratio, stop blaming the beans and look at your grinder.
If bitterness or sourness keeps showing up, the fix is almost always here:
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Hario Skerton Pro Hand Grinder
A hand grinder beats a blade grinder every time, full stop. It’s slower and your forearm will know it, but the grind consistency alone fixes half of most people’s bitterness problems.
Baratza Encore
This is the one upgrade on this entire site I’d tell you to make first. Forty stepped settings, parts you can actually replace, and it’ll outlast your dripper twice over.
Baratza Virtuoso+
More precision than most home brewers will ever need, plus a digital timer that takes the guesswork out of dosing. Buy this once you’ve already fallen for the ritual.