Over the last year or so I've developed a bad habit of rolling my lips in instead of tightening the corners of my mouth when I play. I know what I'm doing wrong, I just can't find a way to fix it. I've worked a lot on my mouthpiece only, but the problems come right back the very next day. The weird thing is, it doesn't affect my playing at all; range, tone, and endurance are all great. I know I should fix it, but it's just not top priority since it isn't hurting me. If anybody has any more creative ideas to fix the problem(or any ideas, really), I'd really appreciate it.