New JP15, pocket is biger than the neck ???

Well, your luthier did a lot of work, made you pay for it ... but I'm pretty sure it's useless.
Just unscrew a bit the neck, align the neck & body, screw the neck ...

Your guitar will not resonate more if the side of the neck touches the body ...
You loosen the strings before you unscrew the neck screws?
 
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