I have always thought part of the difficulty is that the ladies momentum is away from each other in that last pull by, leaving them a distance away from each other. On the end there can be some indecision about being in or out. In XYZ (which has a different set of challenges at the end with the "reverse") the momentum brings the ladies toward each other to start the next round, and makes it a little more obvious when you are out. Those dancing gent can help by giving SUBTLE weith in the correct direction after the last pull-by.

(https://www.youtube.com/watch?v=gBwjTWK3-4g)