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I think extending the pipe is the answer, your cap would not be an issue because you do not have back puffing happening.

Troy, here is some old information from Mother Earth News Jan 86 relevant to on or off grid users alike; Symptoms of a Drafty Chimney Fire is reluctant to start and smoke spills into room at start-up. Some chimneys perform adequately only after the first 30 to 60 minutes of burning. See problems No....

I saw a similar video a while ago, http://www.youtube.com/watch?v=FJ0PYV_qnaU" onclick="window.open(this.href);return false; in this case, he welded a couple of old hammers to the base. A good use for scrap, and probably a little less manufacturing time.