I have the exact all grain recipe in my fermentor right now and hydro samples taste great (like coffe with a little creamer almost) per the orignal recipe. Goes into bottles this weekend. I personally would leave the Black Patent and Chocolate malt per the recipe, I think it's a good balance. The cocoa powder does sound like a tasty addition though.
No yeast, no beer. No beer, no civilization. Therefore, we really have yeast to thank for all our modern-day conveniences and tasty beer