Starbucks Coffee
Starbucks coffee is not great, it's not good, it's not even okay. It is over-raosted and over-rated. Their Carmel Machiato's don't come close to others from privately owned coffee shops.....Roast your own, enjoy the numerous advantages of fresh coffee vs. Starbucks shipped...
I haven't tried going that fine. It grinds perfectly for me on setting #2, I have't tried to go finer. That does get it very fine. Sorry, I have'nt made any espresso's.
Burr Grinder
You may want to look at Bodum. They have a model (Antigua) that you may like, it sells for about $60-80 and well worth the cost. I have enjoyed mine for several years now.