sounds like you are putting too much weight on your front foot and not pressing hard and accurate enough with your back foot when you ride heelside.
you also might be twisting your body around toward the nose of the board and so not keeping your shoulders parallel to the board.
go back to the blue runs for a day or few and just do as many turns as possible when you do while paying particular attention to these things i mentioned and see if that's what you're doing wrong.
the end result is you want to be shoulders parallel to the board, even weight distribution between front and back foot, and an awareness of your toe edge and heel edge, with both feet.
Last edited by thetraveler; 01-17-2011 at 05:31 PM.