3ds Max Modeling :: Displace Modifier / Making Planar Faces

I am Using Mental ray (max 2010). I have made a topological displacement map at a very low resolution. it is 222 pixels wide by 111 pixels tall (landscape) It is greyscale and low rez because the mesh I am applying it to is 222 faces wide by 111 faces long. (landscape also). I did this because I needed each pixel to become a "height map" in its own right. Everything is working the way i expected.

My problem is.... I need to now make each face z planar. as it stands, they are all tilted in the direction of the grey scale falloff. I have tried splitting the edges of all the faces (quad) and using the make planar (z) function of edit poly mod. No matter how I set the pivot / ucs, when I apply the make planar z , they all average out to the same z plane. I need them to adopt the average of their individual z planes. I can do this but have to do it face by face. That's 24642 faces.