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Not sure if I can adjust the OPV on the Cubika - forum posts seem to agree that any adjustment doesn’t actually change the pressure. I’ve just picked up a small bag of North Star espresso to try a slightly darker roast. It sounds similar in roast to the YB, so will order a kg of YB if all goes well!
Thanks for the tips. Might see if a much lower dose works too, eg 12-13g. I’ve just got a nice flat burred Mazzer Super Jolly and the grounds seem way better than out of the MC2 so hopefully it’s not too many fines!
Nef-
Great, the Super Jolly will definitely be up to the task. Careful going really low with the dose, you start running into issues with headspace and the coffee washing around in the basket.
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Does the Cubika do pre infusion? If not it might be worth experimenting with manual pre infusion to se if you can change the flow at different grind sizes
Stevethecoffee
alex_s
Yes it’s a little bit fuller in the roast and easier to extract than most of the single origins but no promises I’m afraid, unfortunately as you suggest the equipment is the limiting factor here; if the shot won’t run any slower then it’s going to pull all the sourness out. Might not be the machine, could be the grinder producing a lot of fines. Your brew recipe is great for a lightish roast but it needs to be slow for more contact time, like 35 seconds for tart coffees. Counter-intuitively have you tried turning the pump pressure down via the OPV? On our pressure profiling machine in the SO programme we do the main infusion at 5 bar for that reason, it gives us body in a high-extraction shot.