The problem is that none of the production photos I’ve seen seem to reflect a pronounced green shift. The JSC is pretty inconsistent in this respect, and so are the print scans. So, although it certainly off-white, if there is a green color, it’s a creme color with the slightest hint of mint.
THAT’S THE COLORS… match to that please! PEACH… look at the PEACH in the faces!
(By the way, I think you ARE matching really close to that looking over your regraded shots. In GIMP I took one of them and by eye moved the middle level of the red channel from 1.00 to 1.07 and that to me was perfect… was a very subtle shift away from the mildly green hue in the background and added a touch of warmth to the face)