I use 15g to 250ml usually. Might try more concentrated brew. But that ratio usually works with the coffee I use. Feel it's probably an issue with the beans or maybe the water.
Not sure what method you're using, but have you tried agitating the grinds a bit more either during the bloom or nearing the end?
@chris0 started
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I use 15g to 250ml usually. Might try more concentrated brew. But that ratio usually works with the coffee I use. Feel it's probably an issue with the beans or maybe the water.