lol, i know you know what he meant, but there is a point when to big is too much, and the same applies to the opposite. only thing i can equate it to, is having a tiny little paper ball, taking a deep breath, mouth wide open, and pushing it when you exhale...then do the same with your mouth shut some, and your lips making a slightly larger than whistling, hole. itll go much further this time. then you could try the same with your mouth shut, and barely parting your lips...like using a paperclip to part them slightly to let a minute amount of air out.