by TrlstanC on Thu Nov 17, 2011 4:28 pm
It sounds like you're in the right ball-park. Here's a couple suggestions that might help speed up the learning curve:
1. You didn't mention what kind of beans you're using, but I'd recommend trying out a lot of different kinds, especially from well known roasters online. The nice thing about trying the same beans as lots of other people on here is that you can compare how it tastes with other people, and find tips on what works best for different coffees. Also, some coffees will just work better with different set ups or are more forgiving.
2. If you can try out some espresso at a good cafe, and use the same coffee at home, that's great too. It might take a little research to find a really good cafe, I'd guess that less then 10% of the cafes around me are consistently good (and that's not even counting SB/pete's, ect)
3. Don't worry so much about tamping, or pump pressure, unless they're wildly off it won't make a huge difference. Grind and dose will have the biggest effects, and don't be afraid to play around with those. In the last month I've gotten good espresso with doses between 12g and 22g and shots that have taken between 20-60 seconds. The best shots will probably fall in the middle of that range, but it's more important to taste the shot and judge it, then judge it just based on how it looks like when you pull it.
Good luck!