My experience has been that 1.25-1.5 lbs of carafa 3 or midnight wheat added at lauter has been the perfect amount for pitch black. I now usually go with (per 6 gallons wort since I lose a lot to dry hops), .5 lbs crystal 40-60L and 1-1.5 lbs Munich have been my sweet spot.
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I guess mine is a lot paler then, as I only put about 2/3lb Carafa III in my ending 5.5 gallon batch, which would also be about 6 gallons before kettle losses to trub/hops, though it was all in the mash, and my crystal was darker. It's definitely dark brown in the pour rather than black, though once it gathers in a sample jar/glass, it's JUST about dark enough. I've had commerical examples that are a similar 37-40 IBU.
At the moment it tastes very loosely like an English porter. No acrid roast in there, more chocolate. I'm allowing for some bitterness from the big dry hop to come, but I do wonder whether a sugar addition would help to dry it out and raise the relative balance/bitterness a little.
I can't force carb any Jim, but I guess some sparkle in there may cut the high FG a bit... maybe.
Adam, I don't have anything going, though I would acclimatise some SO4 in a starter if I thought it was a yeast issue. It's at 75%AA and the 007 normally dries things out OK, so I think it was the grain bill, and my mash was 154 in the end.
I've raised it up to 70f in the primary now, and I think I will lower it down gradually to 59 when it's time to add the hops, just to keep the yeast as happy as possible along the way.