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Problem is mainly channelling, I think. It generally starts out pretty well from what I can see underneath the portafilter, goes reasonably for around 15 seconds or so, then I get thin spurts of coffee spraying all over the shop.
The grind size is pretty much there, I think. If I run it any finer, it doesn't allow any liquid through at all (or barely any), so I've backed it off from that point. I experimented with backing it off further this morning and it came through way too quickly (and also channelled), so I've adjusted it back to where it was (I think - like I said, it's an Iberital MC2, so you've no way of knowing for sure).
My tamping, as I've said, is not particularly adept. I think I probably need to get one of those leveller things.
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ketsbaia
What’s the actual problem, other than apparent channeling? Is it also running fast? Too much coffee in the basket, if it’s weighing correctly, could mean it’s much too coarse.
How does it taste?
How do you tamp? You want to just level it at the top, then give it a firm tamp, and pull it out slowly. Don’t do any turns, spins or tricks. Any loose powder at the top won’t make any difference under ~9 bars of pressure.
New basket will hopefully make a huge difference