Is there a command line way of setting the resolution and refresh rate? It needs to be 1200 x 1600 at 60 Hz, and it keeps trying to make it 1200 x 1600 at 75 Hz.
Most any shell command can be investigated these two ways:
1. For the long story about a command, type this to see the manual entry
2. For the "Cliff Notes" short-version of what a command does, try this
So after taking a look at the '--help' entry for system-config-display, I would say the command you want is this
system-config-display --set-resolution=1200x1600 --set-vsync=60