Quote - 1) Turn on or off shadows

2. Turn on or off raytracing
3. Turn on or off smoothing
4. Turn on or off displacement
5. Change min shading rate (.01, .1, .2, .5, 1, nothing works)
6. Turn on or off Normals Forward
7. Any form of Post filtering.

those are all the fixes. increasing pixel samples, displacement bounds, irradiance caching, raytrace bounces, remove backfacing polygons, shadow bias, occlusion strength, refl_lite_mult et al. will likely have no effect. as there's no texture, one can't turn on texture filtering. the post filter might help to blur it out (along with everything else). one of the hidden settings at the bottom of the render list in the pz3 file might fix it, but I dunno what they do (excepting the hidden GI settings).