That's awesome you got the O/C! Sorry, for a late answer, haven't' been on in a while. We're driving down to my Grandparents' place for the New Year tonight as well.
That seems about right on the volts - I have my regular GTX 460s running at 1024 volts and 900 clock / 1800 memory. So the 560 Ti should definitely hit the 950 range since it's a little more refined and efficient.
Did the O/C help any of the times? I know it makes a huge difference on the 460 series as far as the speed of things. They don't have as many CUDA cores as some of the larger cards, but if you run them fast, it kind of makes up for some of the difference, I think.