Im in school right now and what i noticed is that if you already know a little about the field you are studying, then the rest is just gonna be constructive criticism and also some tips that you might not have known from your instructors. But i do believe that it can make a good photographer better if you take some classes. Im actually surprised you haven't gone to school, I've been seeing your flicks for years now, and they have progressed, but always been good.
If you go to school, Id suggest asking your instructor to go over what you might wanna learn ahead of time, Ive noticed they are open to ideas like that at my school. Good Luck.