At this time of year I would expect the trees to be preparing for fall leaf drop, even if they hadn't just been subjected to the stress of a transplant. So long as the branch tips themselves aren't dying back I would just assume it's starting winter dormancy (possibly early in response to shock) which could be a good thing in the long run. In my area we do fall planting of most trees because they will grow and establish vital
roots through the winter. I think this is the pattern everywhere so long as the ground isn't frozen. Just because you don't see happy leaves doesn't mean your trees aren't busily preparing for next years growth.
You might want to review your watering schedule. Most trees prefer deep watering to frequent watering. Many will even suffer and die if their
root zone is continually saturated. On top of that, if you keep all the water concentrated close to the tree, it has less incentive to develop the kind of wide spread roots that will maximize nutrient and water uptake in the future. Having all the moisture on the surface of the soil encourages the trees to develop roots that are near the surface and so more exposed to temperature extremes, mechanical damage, and drought. This website
http://www.gardeners.com/how-to/when-to-water-trees/7931.html actually gives a really good and detailed explanation of tree watering. Note that they specify for young trees, in hot dry weather as much as three deep waterings per week.