Maybe you fixed it, but...
Have you checked the continuity of the hardware??
My brother buit an LP Kit not long ago and i install all the electronics, i had that issue, black finish didn't have continuity. I fixed it sanding a litle bit the tail piece/post joint. A litle bit too in string holes of the tail piece and tuners and the saddles. Once done, ground conections became perfect and the noise went off.
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