Often times, I will see a diver during practice who will balk, break position or otherwise give-up on a dive because of a bad hurdle, takeoff or any number of other situations that always seem to crop up. The coach will remind the diver that if they do that in a meet, they will probably receive lower scores from the judges or in the case of a balk, have a scoring penalty imposed. The diver usually shrugs and says" I won't do that in a meet!"
It has been my experience that a diver does in a meet, what they do in practice. This is why you practice!! Teach your divers that they need to "practice under meet conditions." They need to be able to do all of their dives without balking or breaking position. They need to be able to do all of their dives with any hurdle or any takeoff and they need to be able to do all of their dives without regard to any other adverse conditions such as cold water or air temperature, early morning events, rain, wind, bright sunlight, bad equipment, etc.
discipline, Discipline, DISCIPLINE!!
This all goes back to teaching your divers HOW to dive and not just teaching them dives.