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wilburpan But I was wondering if there was a reason why the recommended dosing should differ by 3.0 g just based on blend vs. single origin.
The cynic in me wants to say that maybe the blends are slightly cheaper so they need you to up the dose to make up for the lost profits?
I know not everyone will agree to this, but my understanding is that (within reason) the dose is function of how much coffee you want to make (in combination with the yield ratio). So if you are using a 1:2 ratio and want 32g shots you need to use 16g of coffee. If you want 38g shots - use 19g of coffee.
I know the trend in recent years has been to use ever bigger baskets and doses, but why? Does everyone just want bigger drinks? Some claim a bigger dose is easier to pull (or less prone to channelling) but is it really? Is it not true that actually huge doses are harder to extract properly?
And if one gets channelling with a 14-15g dose, doesn’t it make more sense to improve grind and puck preparation rather than trying to hide the problems with a thicker bed of coffee?
I might be totally off here - correct me if I am wrong - but I don’t see any reason why blends would need a different dose from single-origin coffee. I would decide the dose that I want based on the drink that I want to make, dial it in as usual and ignore the dose recommendation from the roaster.