Hola Yoop,
Thinking about brewing your recipe again. Have you considered adding cocoa nibs? If so - would you add them to the mash, boil or fermenter? Amount?
I just saw this, so sorry I didn't answer sooner.
I never considered cocoa nibs- but I despise chocolate beyond belief. I hate the stuff, so I wouldn't make a chocolate anything (not even a cake). I have no experience at all with cocoa in beer. I'm sure many people do make chocolate stouts, though, with good results.