For Jazz neck, I install screws toward bridge. Remove 3 slugs under the bass strings. If it has a cover, this is invisible. If it doesn't, mcmaster carr sells plastic slugs that are exactly the size of humbucker slugs. Put 3 in, get a silver sharpy, no one will notice.
On both, once you do the mod, adjust the pole pieces on the coil with all 6 magnetic poles for even string output.
Boom. Airy, touch sensitive, articulate high strings, non muddy low strings.