It's rare we get a projector that Mike gets calibrated over the range from 20 to 100 IRE, that is this tight - less than 150 degree range.
If the Natural mode has a better color gamut, and calibrates this tightly, then color should be dead on.
Mike reports a strange dip in the gamma reading around 90 IRE. We're scratching our heads about that. Other than there, the gamma looks just fine. The end result is an average lower than the desired 2.2, but overall it looks just fine, basically like the 2.2 we want. I haven't had the time to play with it, but the Epson gamma controls offer a custom mode, that should be able to compensate for that drop Mike noted. We're curious and discussing this with Epson. It's just one of those minor "no worries".
Below, the same frame taken using different modes, and using the same exposure. This is so you can get a handle on the relative brightness and color aspects of the major modes. Of course, since the exposures are the same, the darker modes like Cinema would look better here, if more properly exposed: