Water sprouts are like independent juvenile trees and grow more vigorously with ample N, which can keep sun from the mature wood capable of producing fruit.
Early, quick release N tends to favor serving the spur leaves which are the first to grow in apple trees, but for all tree fruit, early N helps produce larger and higher quality fruit- vegetative growth created by later N creates excessive shade for leaves serving fruit. It may also lead to larger cells in the fruit, both of which makes fruit more watery.
Early in fruit development, size is increased by more rapid cell division which doesn’t reduce its sugar. Later fruit size increase comes from the expansion of the existing cells, and too much of a good thing leads to bland fruit.
Too much organic matter in the soil may increase the release of organic N when it favors vegetative growth because its release increases as the soil warms if it is moist. This is a problem in the humid regions that usually get ample rain throughout the growing season. However, it’s difficult to know whether it is increased availability of water or available N that reduces the quality of the fruit, it may be both.
If you can control the amount of water you can overcome the liability of excessively rich soil. In the northeast, the highest quality fruit tends to be produced in light soil without too much OM. It’s difficult to stop the water that comes from the sky, but lighter soils store less of it. .