I'm not sure what you set yours too but I have mine maxed out...HDR off as it blurs the image. Its much sharper with HDR off.
I use a weather mod to get rid of the very blue sunny skys and it makes the whole image to me look much more natural. I have supersampling set in the AMD control panel but leave it set at application controlled then set it to either 4x or 8x in game.
That's pretty much about it.
this is what ive done, but it doesnt look as good!