On the Vario you want to get it close with the MACRO adjustment which is on the right. Then to get it really dialed in use the MICRO adjustment which is on the left. Each click of the MACRO is equal to 20 clicks on the MICRO. Do remember variables change daily... you must tweak the grind as needed to keep the coffee dialed in based on temperature, humidity, coffee aging, etc. Espresso isn't a set it and forget deal with the grind. Give the Silvia at least 30 minutes to properly heat up. Many often mistake the heating light for the machine being ready, but any machine needs time to heat all the metal, not just the boiler water. When I ask about dosing it's regarding how much you dose into the basket before tamping, etc. Every machine/coffee is a bit different, but the Silvia will probably allow 15-16 grams to be used. It's important to weigh your coffee until you get the consistency right, then check here/there. The Vario is excellent with low retention, so what goes in pretty much comes out. Inconsistent dose usually will cause more issues than tamping, etc. Just a 1 gram difference can be night/day in the cup.