This my sound dumb, but it helped me. When you throw your rotation, don't just be thinking cork, make sure you remember to focus on the 5,7, or whatever rotation you are spinning. If you commit to the whole 5 or 7, you will see the landing and your body will come around. If you just try to huck it, you may not be in control and may not see the landing so you will not uncork. My best advise is just drop your left shoulder (spinnng left) a little, and commit to your 5.