I think that dedicating the cob to aromatics is a smart way to go, but as for the rest of the list that you have provided, at least in my experience, I don't get too hung up on dedicating pipes. I actually find that I like to dedicate certain pipes to certain cuts of tobacco rather than type, for example, I have a small Peterson which smokes flakes spectacularly well but doesn't do too well with loose cut mixtures. Likewise, I have a Savinelli Billiard that is the exact opposite. It smokes loose cut blends like a dream but struggles with flakes. Like most here have said, it's all about personal preference, as are most things in life, and the only way that you are going to gain any real knowledge on what you like and don't like is to break your face on things and figure it out the hard way. Don't be afraid to just load something into a pipe and try it out, it's all about trial and error.