I know it's not for correcting red push and is for the greyscale, but when calibrating with Avia i lowered the color saturation to 0 and noticed when my screen is black and white the step blocks had a bit of a red tint to them. I lowered RCUT by about 10 with the color set to 0 and that really improved the redness a bit. Keep in mind i have no professional test equipment for greyscale but i don't think i needed any to notice the red tint when my screen was black and white. Only thing i'm concerned about is would what i did mess up the entire greyscale once i boosted the color saturation back up from 0? Should there be a little bit of a red tint in the greyscale?