I'm thinking the nut on my DXMG is set too high. If I get the neck perfectly straight, with absolutely no relief, first fret action is ok, but as soon as I start adding even minute relief, the strings start getting very far away from the first fret. Currently, relief is about half a business card, and first fret action is about 0.6~0.7mm (6th string). Action on said string at 12th fret is about 1.5mm.
All in all, this is really annoying. I can't really get the action near where I want without lots of annoying D string buzzing and high action on the low frets. There's no real reputable guitar techs around about either... I wish I lived near OctaveDoctor