The Aquabatics Calgary team has a good instructional video on how to boof a kayak. I think it's helpful that it's tailored to moderate whitewater, which makes it more usable for a lot of people (even though the concepts and moves are fundamentally the same as they would be on more difficult stuff).
Notice the edge transitions, which are nicely demonstrated. And remember, the key to great progression is getting comfortable with hard moves on easier whitewater. You can often make your own Class III, IV and even V moves on runs that are a class or two easier just by trying attainments and hard ferries.
Just because everybody else is bopping down the river without catching eddies and making ferries doesn't mean you have to. :)