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Coffees that are over 2 weeks from roast date behave much more consistently and are more forgiving.
Very interesting, I didn't know that. I've started using Monmouth espresso all the time now as it's predictable and easy. I used to order bags from hasbean, but often had trouble dialling in and producing consistently good espresso. Maybe it was partly due to them roasting to order?
If I was to leave the bags unopened for a couple of weeks, might this help?
Is the Red Brick well rested? Coffees that are over 2 weeks from roast date behave much more consistently and are more forgiving.
I wonder if you may be having some consistency issues with the retention of the grinder - it may well be collecting a few fractions of grams and then dumping that excess at unpredictable intervals. Really fresh coffees will have a bit of a paddy about that but well rested ones will deal with it.
Have you tried filling up the hopper and using some other means of dosing lately? That might help.