Any eggs that were in the incubator with high temps would have been affected by the heat they received. A few hours of excess heat can be enough to kill a baby in the egg, cause deformities or other problems. Moving those eggs to cooler temperatures might not have any affect on those eggs, only those that were laid and placed into the cooler temps from the start would totally benefit from those proper temps.
A healthy first year breeder female should lay healthy eggs with babies that have no problems hatching. She may lay one or two infertile clutches before she starts laying fertile ones, but beyond that all of the clutches should be good. If you have a female that has been laying for a long time with no break and is getting depleted, her last few clutches may go bad due to the fact that she was not healthy enough when the eggs were developing and being laid.