I did a little research, and 1.65 volts seems to be Ok.
Yes, you should change tRC as well (according to that XMP-1600 profile in CPUZ)
I figured out that all of these memory modules are similar, so if it has 9-9-9-24 timings then it was built on the xmp profile, which determines that the tRC is 41! Your ram is still runnig because you have a chip which is capable of overclocking (not on the long run XD), and your timings are wrong because you probably have a factory BIOS version, which tends to be outdated even at new boards, and your mobo doesn't heard of your exact RAM model.
Your mobo have set a RAM profile (JEDEC #2), which is used in DDR2 RAMs, all u have to do is adjust your timings to the XMP profile, or simply enable X.M.P. profile in the BIOS