The middle pickup I have quite a way down otherwise it interferes with my picking. On the neck pickup, it sounds like I have the same problem as you. I seem to want the pickup closer to the strings but it just won't go that far because I either run out of screw or out of spring. At the moment I have it as high up as I can get it, having stretched the springs a bit, but it's still not ideal. What I really need is longer screws and springs to use but they don't seem to make them any bigger than I already have. Very frustrating.