I haven't had CH for a while, and when I went to buy a pouch nearby at smokerfriendly, they had neither tub nor pouch, so I bought their last pouch of PA. However, I thought I'd throw a few ideas in the kettle. Tambolaka might make an interesting base note; I'd just go with a sturdy pinch in a bowl's worth. Black Cavendish would give CH a little more volume to the smoke and might actually bring up its constituent tobaccos too. McClellands Red Cake Virginia 5100 might sweeten it and give it a bit more depth, and I'd go about equal parts with that. Again with the base note, I think Mac B's Old Dark Fired, rubbed out to appropriate size, might do interesting things in a wide chamber, a pot, author, or diplomat, for example. Mixes can really turn up good taste and fragrance. Some of my best smokes have been homemade "blends."