As far as the 12 volt rail is concerned it is only a 5/100ths of a volt variance.
It never falls below 12 so don't read anything into it that is not there cuz there is nothing there that is wrong. As a matter of fact that is excellent. There is that what you were fishing for? a rave about your 12V rail.
Just what are your core temps. If they are fine turn up the volts.
My 6600 has been running at 1.65 for a year now. Sometimes a little less sometimes more. I have good cooling though. Your v-droop is about normal also. Don't get too caught up in all the precise measuring crap and turn up the volts using your core temps as your tattletale when to stop. Put more fans on the memory and NB and stuff more air in there if necessary.
People's fear of voltage just cracks me up.

WZ