I have a similar situation:
http://forums.gardenweb.com/forums/load/maple/msg072358522661.html?5

My leaves are also droopy, but I don't recall seeing holes. Droopy usually is a sign of reduced water in the cells. However, since we probably have damaged the roots during planting, there is little we can do to make the plant absorb more water before the new roots grow.

My only advise is to mulch the nearby ground. This way your ground dries out much more slowly. The decomposed mulch can also enrich your soil in the future. You can easily check out some mulch guides online.

I don't think it is a good idea to replant the tree now, as (1) you haven't really made any mistake, (2) you don't want to damage the roots again in mid-summer.

We also have heavy clay in the neighborhood, and lots of wild thriving maple tree. So don't worry about your tree not thriving.

Good luck.

Well it sounds like you *did* ammend the soil. Technically, when you blended the top soil with the native soil, that's what I would call ammending.
This practice is not recommended for trees. The reason being is it creates a drainage problem known as "bathtub effect" that can lead to root rot.

If this was recently transplanted, it could be a matter of too much or too little water. Some photos could help shed some light on this.