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Ok I’ll max out fineness and try increasing weight.
I’d done - 18, 18.5, 19, 19.5 last two days. I’ll try 20 and 21.
Will report back.
Tenderloin-
if that fails you may need to recalibrate it, it's piss easy to do, there's instructions online for it.
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This is a good idea- ‘choke’ the shot (so fine that you only get a couple of drips out of the portafilter) then work backwards to find a good level. Gushing shots never taste good but over-extracted ones can often be ok or rescued with milk.
HatBeard
Bainbridge
mess with the amount of coffee used, try going up/down 0.5g and see if that helps at all.
some coffees I use 19g others 20g, sometimes it alters as the coffee gets a bit older/staler