I get a lot less channeling now that I've got less pressure, and also the quality of the coffee definitely plays a part, I very rarely get any from my Dark Arts subscription, supermarket stuff is more susceptible.
How low is the pressure? This has been modded down to 9 bar, could go lower though I suppose
It's got the 9 bar spring in it, I'm at a loose end so might give stepping it down a go.
@Turkish started
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I get a lot less channeling now that I've got less pressure, and also the quality of the coffee definitely plays a part, I very rarely get any from my Dark Arts subscription, supermarket stuff is more susceptible.