You have pressed the grinding right found when 30cc of water within 25 by 7 grams of coffee . Adjusting the mill listening very closely and is a blend again different. If the coffee runs faster than the specified 25 seconds, then there is too little extraction and taste a little flat , the mill must then be put finer. It takes longer , then there is over-extraction , the coffee will be bitter. In this case, set somewhat coarser your mill .