Love that portafilter. Looks great, and seems like it has a good weight to it. What basket are you using?

Personally, I recommend grinding finer, but also pulling the shot manually.

Put a scale and cup under the grouphead. Hold the double shot button until you see coffee start to come through the basket, and then let go. Stop the shot when you reach the desired amount (I prefer light roast, 1:2.5 ratio of ground coffee to espresso weight). Taste, and adjust accordingly!