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Try loosening the screw inside the buffer tube a bit; it screws into the spring guide and I've seen some mechboxes (like the Progears) that had a bit of play at the rear, so if you overtightened that screw the whole mechbox would get pulled back/down a bit... tiny little bit, but enough to cause this kind of problem.
As for wires, I usually run both on the rear of the grip, along the ridge where one of the screws goes into. I've never really run into problems while doing that.
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