Checking it out now.
Just ran the game. The banding, of which I had pretty seriously, is toned way down. Good job and thank you. The following pics show the differences with your recommended gamma setting in the middle and with it two to the right.
January 1940 2200 naut Gamma middle
January 1940 2200 naut Gamma two to the right
January 1940 1400 naut Gamma middle
January 1940 1400 naut Gamma two to the right
Although there is some banding when looking in the sun's direction it is nowhere near as bad as vanilla. If looking away from sun all banding is virtually gone.
Syncmaster 931bf/GeForce 250GTS/1280x1024/Gamma on monitor at 1.20
I appreciate your effort with this.
WV