Ok, for some reason dxdiag is reporting an earlier file version but the driver version number is correct for Catalyst 13.1
Driver File Version: 8.17.0010.1129 (English)
Driver Version: 8.970.100.7000
If those drivers and a Catalyst reset aren't fixing the issue though, there's not much more I can suggest. It would be helpful if you were able to swap out the card with something else to see if the problem remained or went away.
It could also be a game setting. Try changing this line in your D3Prefs.txt file
This may actually cause a slowdown in performance but may unlock graphic features you're currently unable to experience.