I think you're body position might be off. you may be in the "back seat", or letting the board ride you! (kidding) you're shoulders need to be more perpendicular to the board (of course it changes as you ride). In freestyle riding, one shoulder is set back and you kind of look over you're shoulder. I think alpine riding body position is more like a skiier. so when carving, the shoulders should follow where you're looking. heelside (for a goofy), you initiate, start to look up hill, or to the other side of the trail (of course more things are happening). the shoulders should twist as well, following you're head. the arms should be down near you're sides, elbows bent, kind of a "ready" position.
hope that helps, thats my :barf:for you!