I bottled the beer and it has carbed for a little over 3 weeks and no bottle bombs, so I guess it was done at 1.020. The carbonation level is actually lower than I excepted, but I aimed for 2.5, so for a stout I guess it's still OK. The IBU was calculated to 39, but it tastes like it's more bitter than that, and the bitterness is a little harsher. I guess that's because it originates from the chocolate/black malt (i used ~9 % all together). Overall it's still good, in fact the best beer I've made.