I've been playing around with the grind and trying to get the right size. I've noticed that even a little change in grind can make a huge difference. Also, my Bistro has four buttons on it; I'm not sure which one to use. I have a La Cimbali double spout portafilter. I've been pressing the one tall glass button. I'm using two little 2 oz cups and took a couple of photos of two shots, which are about a quarter turn off from each other on the grinder. Everything else I did the same. I noticed there is very very little clearance between the tamper and the inside of the portafilter. It really takes some practice.
Would you guys please evaluate my shots below and tell me if one of them is close to what it should look like? Note that there was a second cup on each of these, so the amount of liquid I got out is roughly x 2 what you see in each picture.
Sorry about the lack of flash on the first one.
First, with the coarser grind:

Now, the finer grind:

Thanks!!!
If given a choice between Starbucks and espresso, I'll choose espresso every time.