Nope, you'll never get that pin to hold perfectly still. You've got to realize that big muscles in your shouldars and back are holding the bow at full draw. Those muscles don't have that pin point movement required to hold your pin still.

Here is one thing that you may try. I know its worked wonders for myself. Draw your bow, settle into your anchors and put the pin on the target. Relax and watch the center of the target for about 10 seconds or so. Then, let down with firing a shot. Do this several times, then shoot an arrow. I think what this does is helps you get accustomed to seeing that pin float around on the target.

Hope this helps.