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Agreed that looks like it needs a finer grind; how much espresso did you get in those 27s? Seemed like a lot. Don't think it'd be the tamping that's the issue. You sometimes can get less channelling if you pre-infuse (I think the Mr Shades PID - which I recall you have? - has that functionality?) because the puck is given some time to expand evenly before being hit with the full 9bars of pressure. I might disagree with @jonny69 and think that WDT is probably the best thing you can do to distribute and break up clumps, and I think the leveller is pretty efficient to use if you've got it (does the same thing as tapping against the palm but faster). Although I never bothered with either myself because the Sette made fluffy grinds and I preferred to live with the occasional spurt out than increase prep time by 30s per coffee/get all the extra tools.
youClown-
Nah, no option for pre-infusion with the shades PID. Seen some talk about adding a dimmer switch on the supply to the pump, but it seems a faff/dodgy.
I’ve always wondered, would hitting the brew switch for 3 seconds or so to get some water in, waiting for 10 seconds, then starting the shot properly work as a pre-infusion?
Nef
I’m ticking most of those boxes. Heated portafilter, grinds into metal cup.
I’m really making sure it’s even in the portafilter, and tamped level etc.
Will try again this afternoon. But I think finer is the key.