[jjslegacy]

I first tried to just remove all the xrandr settings I had in the openelec setup and unwind any settings I had in kodi.

This meant - chromebox would be at Limited ( I think?) and the projector was set at standard (16-235). I also turned off the use limited range I had set in kodi.
I had dithering setting was enabled by default.
This looked pretty good but the grayscale ramp still didn't look 100% smooth like it does with the full/software limited range option I had earlier.

You could try lowering the dither bit depth to 7 or 6 to get rid of banding. Using xrandr to set GPU output to full range is the better option, but if you try this, please report here. Some users may not be able to get around the GPU like that.

Some quick testing before my wife got bored and made me put the movie on showed that a bit depth of 6 looked pretty good. Will have to test a bit more