There is definitely an undervolt between what you set and what you get in BIOS for CPU VID and NB Voltage... just dial in some extra to compensate. There's more info on my blog (via the link in my sig). VDIMM is similar but not as bad... what exactly is the gap you are observing?
The actual droop under load of these values is not bad. CPU droop is much better than most and NB and VDIMM is insignificant.
When you can't boot due to your OC, use the power/reset button trick as described in the manual to quickly clear CMOS. Keep your baseline settings in a "CMOS Reloaded" profile and you can quickly get back to where you were in no time.
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