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If you can't grind finer you can try increasing the dose a little bit (up by 1 gram?), are you sure the distribution/tamping is good though? ie. are there any holes etc. in your spent puck, is it possible to get a naked portafilter to see how the thing develops?
It could be the beans, some machines (cough Sage cough) need really fresh beans. How does it taste?
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These aren’t freshly roasted beans, they’re a cheaper bulk-roasted bean that I’m using to get a ballpark setting for my machine before I start using more expensive beans.
Not sure I'd bother doing this in all honesty. I started off by doing this when I got my 1zPresso JX / Robot but then I was like.. hang on... why am I doing this? I have no intention of ever using this coffee... it is darker than any coffee I'd ever drink... it's older than any coffee I'd ever buy etc. So even if I got in the ballpark of those beans, the ballpark of the beans I actually want to use might be totally different. And they were.
You should be able to get in the ballpark pretty quickly even using nice coffee. Maybe three shots to get close and then fine dialing? It's worth it I reckon.
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@Jonny69
Dialling in. I’m down to a grind which begins flowing at what I would say is the correct rate, but after around 15 seconds it starts to flow very quickly and I end up with a large shot. I am going to go finer, but I’m pretty sure I’m close to choking the machine. These aren’t freshly roasted beans, they’re a cheaper bulk-roasted bean that I’m using to get a ballpark setting for my machine before I start using more expensive beans.
If you had to diagnose that shot, would you say it’s the less fresh bean causing the rush at the end?