Very happy to hear that! It's so odd, but I guess you lucked out with the difficult cards, that XFX of mine drove me nuts, as it was completely different than any other 7970, but it was a card that I had prior to mining, and I wanted to maximize my mining efforts by using all available cards. 
You won't find too many cards need those settings, as most 7970's I've used are quite happy with 1040/1500.
You won't find too many cards need those settings, as most 7970's I've used are quite happy with 1040/1500.
One final note: after all was done, I had upgraded from AMD 12.8 to 13.9 drivers (in the process of trying to get my 7970s working). Once I put my other cards back in I found they were about 60 Kh/s below normal.
I uninstalled the 13.9 drivers (and deleted amdocl.dll and opencl.dll), reinstalled the 12.8 drivers, and that got me my 60 Kh/s back on my other cards plus a good 70 Kh/s on these 7970s, which now puts me well over 700 Kh/s
I guess I could build up another but I'd like that to be a last resort.
