My multi is 2.5 and I've got my ram at 950 MHz with the timings set to 4-4-4-8. It's perfectly stable too, no problems with it BSOD'ing at all or anything. I think that at the very least you should be able to get those timings down to 4-4-4-12 with your current frequency. And I know for a fact that Ballistix can go to 1100 MHz 5-5-5-12 because I used to have mine around there.
One thing, check your RAM's voltage. My mobo defaulted it to 1.8v but the Ballistix is rated for 2.2v so I had to increase the voltage in the bios which improved stability a lot.