I have had one MD P for about 6 months now. I had to shield it because the static noise was a no-go on my trace elliot AH600-7, shielding worked. I by-passed the vol-tone pots, had pickup connected straight to the jack, with good results for me.
about the neck,it kept bowing forward after perfect adjustment. I removed it about 15 times to get it where I wanted it (and I have some experience with truss rod adjustment). As I see it it does behave weirdly, when you tighten the truss rod it back bows dramatically, but as you tension the strings one by one again once you put the neck back, it keeps bowing forward as you tighten, to finally settle on its definite position, so you got to guess right on your truss rod turns. I had never seen this behavior on a neck probably because on "regular" truss rods you don't have to remove the neck, hence, not having to loose the strings entirely.
another thing I find strange is that when your strings are tensioned, if you pull back on the neck from the headstock while holding the body, it does moves back very easily, cant tell if its normal or not as my experience is not that vast.
truss rod is TOTALLY maxed by now. I'm just hoping that the neck will resist forever on the position it has now, because the action and intonation is just perfect and it hasn't bowed any forward for a month or so by now (it wasn't resisting not even a week before it settled).
if it keeps bowing I would definitely say my MD P has a faulty neck, truss rod wont go any further and i dont even know if the washer thing will help, we would be talking about planing it and thats just wrong for a 2012 instrument