Most people don't realize how moody coffee is (i did not either till I started my current job) anyway there are a few things most people don't know
1. Beans "die" (taste wise) after 12-24 hours after unsealed
2. temp of the water used in the brewing affect taste
3. Time it takes it to brew can make it bitter or weak depending
4. Espresso beans are the same as coffee beans but the ones rated espresso are better quality like say eggs the espresso's are A or A+
5. a good filtered water system will improve that taste as well
I know it is not what you ask about totaly but thought you might like to know