Watering wet leaves does not cause leaf burn, except perhaps for some plants with hairy leaves, otherwise it is an idea that has been debunked. If it was the case plants would get leaves burned every time the sun came out after a shower. Here's an article about it:
https://puyallup.wsu.edu/wp-co...
I have a Japanese maple in all day full sun here and it has never done what yours is doing although admittedly in a different climate. Yours is only in full sun for a maximum of four hours a day. Was it in deep shade where you bought it or part shade?
I would not stress it further by moving it again at this point but do check the distribution of the leaves, as Daisy suggested. Although ultimately all leaves will wilt due to a water issue, it will be the youngest ones that do it first. Also the above article gives some ideas about avoiding leaf burn.
Can you tell us how you planted it? Was the rootball intact? I assume it was in a pot?
