Sourness Issues by James DiStefano | Jan 11, 2016 | News | 0 comments Sourness Issues I had my Gaggia classic for about 2 months now, I roast my own beans which are Colombians stopped after first crack. I grind about 17.5g each time into a double basket, and shots pulled at 25-30 secs. more info… Submit a Comment Cancel replyYou must be logged in to post a comment.