erkal - Unless you have a fully controlled and stable environment, a grinder that is 100% consistent and a coffee that never ages.
So it’s said that, for consistency, it’s best to control the ratio of the beverage over a period of time, but just roughly. Of course you don’t want for your 18g in, 36g out to last 50s nor 20s. But something between 30s and 35s is acceptable.
Maybe a Sage/Breville Dual boiler would have been a better choice for you, as it has volumetric capabilities. Saying that, I have no idea how accurate that volumetric flow controller is.
