Posted: Sat Feb 23, 2013 3:34 pm
The pour starring at 10 seconds suggests a fine grind, so getting a 30g pour suggests you ran the shot too long.
Going coarser and still getting a similar effect suggests inconsistent distribution. Getting a gush in flow and a split puck also suggests the same.
If your pours are quite show then you are trying to pull risrettos, which are at the underextracted end of the spectrum so can be sour if not done well.
I would try going a little coarser and taking lots of care with distribution and try to get 30g plots in 25 seconds consistently. The normale extraction ratio should give you leavess soureness.
If you have or can get a portafilter with no bottom, you can easily see tamping or distribution issues.
Going coarser and still getting a similar effect suggests inconsistent distribution. Getting a gush in flow and a split puck also suggests the same.
If your pours are quite show then you are trying to pull risrettos, which are at the underextracted end of the spectrum so can be sour if not done well.
I would try going a little coarser and taking lots of care with distribution and try to get 30g plots in 25 seconds consistently. The normale extraction ratio should give you leavess soureness.
If you have or can get a portafilter with no bottom, you can easily see tamping or distribution issues.