Sorry to hear you had a bad hatching experience. Seeing as they pipped on day 24, the temperature was on the way low side. This is why it it's so important to have an accurate, reliable, calibrated thermometer and hygrometer, seperate from the manufacturers installed sensors.
Not only genetics but nutritional deficiencies of the parent stock, sanitation of the incubator, frequency of turning the eggs while in storage awaiting incubation and during incubation, also the temperature at which they are stored, can all have affects on the developing embryos, as well as alot of other things not stated.
Better luck next time, hope this experince doesn't discourage you from trying again. Hatching your own birds is very rewarding.