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An ND grad wouldn't have helped you here really. You could have used it, but then you would have been dealing with the bluff on the right being too dark.
Again, you got some super lighting in this, I have shot from that area a few times, and you have captured it's beauty really well. Shooting it towards sunset does make for a harder lighting situation for one to deal with, but in both of these now, you have the basics of 2 great shots.
A couple of suggestions for finishing these off. In CS6, use the contrast adjustment to add more contrast, and then use the brightness slider to control blowing out the sky. Perhaps you will need a simple layer mask so you can adjust for the sky area separately from the ground/bluff area.
Also, ACR in CS6 is very powerful and does a much better job with containing highlights and exposing shadows. So perhaps try a sample run through with the raw file through ACR and just see what happens when you pull out shadow detail, while adjust the highlights to keep from blowing out?
Just a few thoughts for you.