Below is a video by Pete G.  that is designed to help show you proper body positioning.

Some key elements to notice are:

- arms are relaxed

- Pete moves his butt into position for the corner BEFORE he countersteers.  When the time comes, he countersteers and simply lowers his upper body into position.   There is no "hopping" around.

- Notice how his centerline (the line from the crack of your butt to your neck) is on the inside of each corner.