Watch your batten tension - apparently super tight battens can make hoisting tougher. Second, having the line exit the ring toward the mast will tend to tip it foward and away from the ring as it is hoisted for release. That said, when releasing, try to keep a little tension on the halyard while you rotate the mast AND pull down on the sail (this will take three hands). Be certain you are rotating the mast at least 90 degrees when trying to unhook and it might be helpful to have someone bend the clew of the main toward the center of the boat while everything is rotated (to twist the main away from the hook).