Answer: I'd guess it's the combination of newly transplanted and the winds that caused the Japanese maple leaves to brown on the tips. As long as new growth looks okay, the leaves don't continue to brown, wilt and drop and the general vigor of the tree is fine, then I think you'll be okay. It will take awhile for the tree to shake the transplant shock, so keep it pampered with water, but as you said, not too much! Mulch will help conserve moisture and prevent you from having to water as much.
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