Beginner and pro baristas share tips and tricks.
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Based on the coffee's description from their website and the directions they give (19.5 g in/44-45g out), I'd say you need to make your grinder coarser. Those directions indicate this is probably a medium roast, so I would try 202 f or so temp. But sour is normally an indication of underextraction. You want to extract more of the coffee solids within the 25-35 sec window to get more sweetness without veering into the bitter/cardboard flavors that indicate overextraction. Here's a link to a great video on dialing in according to roast as well as taste: http://www.youtube.com/watch?v=NzqN7SH9H8Y