I've found playing from playing a hard reed on a really resistant setup and trying to minimize fuzziness, especially at low volumes and on lower notes, of course you start with a foundation of breath support, but I find if I concentrate on pulling not only my lips at the corners to form a supported embouchure, but farther back onto my cheeks to create a better "tunnel" to focus the air, it really helps. I have no idea if this is correct playing or not, but it works for me, so frankly, I don't care. FWIW, I heard myself playing on a recording the other day and it sounded great- I was even surprised. If I was any good at anything else on the clarinet, I'd be really happy!