Ah Sand Hill.... I'd like to say that I have fond memories of Charlie 1-50, but I don't. Road marching in sand is not natural, and neither was infantry basic...funny how I actually miss it. Anyway, reminiscing is not helping, so here you go. First of all, do you actually need the voltage bumps to run stable? I've seen plenty of proper OC's running @ 3.8Ghz with this CPU that required no extra voltage. If you are unstable, might I suggest that you revert to stock voltages and address some small issues that I see here.
First off, your QPI is too high. If there is an x32 setting available in the BIOS use it. If you were unstable in your initial overclock before adding juice, this is the likely cause.
Turn Load-Line Calibration off so you're running at Intel spec.
Check the suggested voltage of your RAM. It is likely 1.65V even though most BIOSes default to 1.5V for DDR3, and if you are OC'ing your RAM past spec those volts are important. If this is the case go ahead and bump it to 1.66V since that is likely the next available setting.
Leave everything else on Auto for now and stress the machine. Hit me back and let me know how it goes. Nothing wrong with overclocking if you can keep your gear cool, but over-volting when not necessary will shorten the lifespan of your components.
Make sure you look out for the brown recluse, and don't bother the endangered red-headed cocksucking woodpecker. Yeah you know what I'm talking about.