Make sure to space the main scaffolds properly and to pay close attention to the amount of light that reaches to the scaffolds and limbs. For apples, avoid training the scaffold in either upward or downward directions. You want the limb angles to be somewhere between 45 to 60 degrees. If the limbs are pointing downward, they will likely break when they have a full crop and most likely will likely produce a large number of water sprouts. Use limb spreader to adjust the limb angles into the proper orientation.
Peach trees are extremely sensitive to light penetration.
Under severe situations, new growth may be killed by low light. Also low light will result in less fruit-wood development. For these reasons, proper spacing of limbs to allow adequate light will result in good fruiting and good color. Do not head scaffold branches, bend them to a wider crotch in order to make them to fruit early so their vigor will be reduced. Water sprouts that are in a good position on the tree can also be converted into fruiting wood by bending them downwards.