Is this at NTSC pixel ratio? Remember, at 1:1 pixel ratio, NTSC is 720x480, an aspect ratio of 1.5:1 instead of 1.33:1.

NTSC has a pixel ratio of 8:9, so to calculate the correct ratio, you have to correct the resolution from 720x480 to 720x540 before cropping. It doesn't seem like you did that.

At the correct resolution, I'm seeing an AR of about 2.30:1-2.32:1. And if you weren't aware already, there's some sort of anamorphic distortion issue where the image gets thinner on the ends.

And the GOUT isn't actually that heavily cropped. The earlier transfers actually may have showed a little too much on the top and bottom (in the JSC, you can sometimes see the bright garbage around the frame during optical composite shots). And due to two different camera apertures being used during filming, framing the transfer to fit inside the smaller aperture will inevitably cause more picture to be lost in the scenes with the larger one, since those shots use more of the film frame.