CJR wrote:...I like the toasty-chocolatey taste you get in certain very strong stouts. I figure the lactose will add a certain smoothness to the brew. I might take PA's advice though. As for the 5% Black, should I possibly add more chocolate to compensate? 12% choc, 3% black instead?
Possibly, it's your call. I only used 8.3% Chocolate Malt, and it still tasted insanely chocolatey. But then, that was American Chocolate Malt, which is 350°L,
much darker and stronger overall than typical English Chocolate Malt. Perhaps 12% of your Chocolate Malt would bring-about a similar result, I dunno. A friend of mine often brews with >10% Chocolate malt, and it's tasty, but I confess it's so dominant that it becomes one-dimensional.
Here's more food for thought: true-to-style porters and stouts
ALWAYS benefit from some Brown Malt. So far, you have suggested 2 parts Chocolate to 1 part Black, or 4 parts Chocolate to 1 part Black...but what about filling-in that middle ground with something like 3 parts Chocolate to 1 part Brown and 1 part Black (9% Chocolate, 3% Brown, 3% Black)? Just an idea. No matter what you decide, with the addition of milky residual sweetness, you're talking about a crazy cool, complex dark ale.
Which yeast strain are you thinking? Please don't say Chico.
Happy brewing!
P.S. Matt12398 makes a great point. I don't claim to be an expert on water treatment, but at the very least, I'd highly recommend some Calcium carbonate (chalk) in this particular mash.