The beer is still flat. This is a Porter kit from Defalco's and the 6th time I've made this same beer. OG was 1.056, 5 month primary @ 62-64*F, FG was 1.015, calculated 3.1 oz priming sugar based on temperature, bottle conditioned @ 72-74*F. Yeast was US-04, and the beer spent 5 months in a...