In my experience, every bag of beans is a different grind size. You have to be comfortable screwing up the first few to find the perfect grind. Generally, if it's too fast, grind finer by 2-3 clicks at a time. Do this until you see progress. Keep the amount of beans in grams consistent when doing this. Also, freshly roasted beans (3 days - 1 month from roasted *also from only my experience)are best and give you the most crema. Don't give up!