Thanks! i'm not a guru in ocing and still have a lot to learn about this mobo, so i'm very pleased to have suggested you something right!
about using a lower multi, it depends on you and on your specific hardware. in real world a lower multi bring you very little performance boost, while benchmarking benefits a lot more, but if you're on the way to pull out every single little performance boost out of your hardware, usually the lower multi is the best choiche. but be prepared to work very hard: a high fsb implies higher voltages and higher temps but most of all the patience to find the right combinations of each settings: it's very time comsuming!
first, i would find the stability at max oc with 9x, wich is usually easier as you put a lower stress on your mobo, so you can also find the right vcore your cpu needs for that clock, then i would start messing around with performance level (the lower, the best) and different FSB strap, memory clock and timings. run some of your favorites bench
after that, if you still have time to wast, relax PL and RAM and start looking for the same oc clock with the lower multi, run some bench and compare them with your previous settings.