Help before the Chicago St Patty's day parades this weekend! This is the 2nd year that I have brewed my own "Guinness". Last year's "Guinness" was great,,, except that my Guinness tap didn't have the 5 hole pressure disc. I quickly took care of that and had great "Guinness" & "Bass". I know,, bad Irish man for having Black & Tans for St Patty's day, but I didn't have a Harp recipe. This year I made "Harp" (turned out fairly well) along with the "Guinness". However, the "Guinness" comes out flat! I have N/CO2 gas, the disc in my Guinness tapper,,, but flat stout! I kegged conditioned both the "Harp" & "Guinness" for 3 weeks. When the "Guinness" wouldn't pour right, I force carbonated it, but still a flat pour.