I'm enjoying the process of exploring how different tobaccos perform in different pipes. I do find that certain tobaccos smoke and taste different depending on which pipe I smoke them in. For example, I find that flakes smoke well in narrower bowls and that shag cut english blends smoke well and taste great in wider shallower bowls. This isn't a hard fast rule but seems to work for me. There are other factors that play in as well such as how moist the tobacco is, how it's packed, etc. I typically smoke full flavored, heavier tobaccos flakes in smaller bowls - Irish flake or Old Dark Fired for example. I do have to say that cobs always smoke great for me. I do find they might compromise some flavor of certain blends but they smoke cool and dry generally.