I'd be fascinated if that solved the problem.  The wall is flat, and mapped planar;  it doesn't get any flatter (in UV terms) than that.  The problem occurs when a render engine must assign a pixel of texture image to a pixel of render image.  That is calculated relative to the mesh polygons, as they are viewed in perspective of the camera, and "needle"-shaped  triangles exacerbate rounding errors.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5