I’m sure your white balance is fine. I just think the screen you are using really isn’t very close to chroma green. It is more of a “yellowish” green.  A yellowish green color does have less spill than pure chroma green…. but as the color becomes more yellow, it makes the extractions more difficult to do. So the color is right on the edge of what EZGS is programmed to do.  I plan to make the minimum adjustment down to 80 or 75 in the next release. However, there is a limit to how low I can make the lower limit before it starts having issues removing yellow clothing, and/or leaving hair choppy.