I've seen anecdata (launch reports on the other forum) suggesting the Majestic may be marginally stable by itself. My hypothesis is that skinnying the fins up to make them more or less triangular gives away too much area compared to the fins on the Ascender, which AFAIK are the same as those on the booster. I bought a couple of those fin cans and some of the 2-inch tube before Estes closed it out that will be combined into single stage rockets when I get around to it.