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Try stopping the shot at the desired weight and check the time, rather than running it for the desired time. It’ll just be a quicker dial-in. Like @mmccarthy said, don’t obsess over the “correct” numbers, but I’m sure you’ll need to be somewhere in the 23-32 second area, keeping your dose and yield constant. Dose is the most important, then yield, then time.
Tamping – just do it nice, straight and firm without breaking your wrist, and let go. Don’t bother twisting or spinning as it can actually ruin the coffee bed. Don’t stress if it’s not shiny on top, it’s about to be crushed by 9 bars of water. And a simple firm tamp is more easily repeatable, meaning you can just adjust the grind size and keep everything else constant.
hangedup
Black mirror’s turned up today, 2 day delivery from Sigma coffee.
So now I am weighing proper doses and am realising that I am way off the documented 18g in 36 out in 24-30 secs.
It’s more like 18g in 60g out in 24-30 secs.
I assume that’s because my grind is not fine enough as I feel as though the tamp is solid enough as is.