70/30 mix is too much CO2 for 32-33 degrees. In Ireland , they use a 70/30 mix, the kegs are not stored as cold as we store them but the beer is run through a flash chiller for serving. Because we keep our beer storage temp. colder , they reccomend the 75/25 mix @38-42 degrees. The colder the beer, the more CO2 it will absorb. Your Guinness is overcarbonated. Tapman
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