Just bottled one of these following the "Brewing Classic Styles" recipe. Did not measure OG (I know I know) but according to recipe was supposed to be 1,066. Kept it in the fermenter for 3 weeks, in brew fridge at 18C. Airlock activity stopped after two weeks. Measured the FG prior to bottling which was 1,036 - was supposed to be 1,019. Siting in PET bottles, does not feel overcarbonated. Do you think it will be drinkable? I did use a can of cocoa powder (200g) - am thinking that this may be the cause of the "denseness" of the beer?