Okay

First export the model from the export options box at the bottom right of the menu. turn off grp and turn on MRG. leave scale at 1. Export. Try the maps now. Scale is and always will be an issue in Maya.

Adaptive is fine for now too....

also can you show me yor alpha gain settings etc for the dis map.

then we can move on. We'll do a process of elimination. Im at work but with ZB here so will do what I can to help until this evening

Jay