well, up that vccsa, lower that PLL, enable the option I mentioned, and reboot.
try 0.025V less on CPU.
You aren't pushing high ram clocks, but as CPU speed increases, so does NB/L3 speed,(it's tied to CPU speed, haswell separates these), so the load from NB/L3 is greater when CPU speed is increased. NB/L3 interfaces with PCIe and memory controller, so these two are getting more action as well...so they need adjustment too, although they may be running "stock".
I don't have 4930K, but have a few 4960X, which is the same basic chip.
I always like to start with 1.25V CPU voltage, everything else as I mentioned, and then set 2666 MHz ram @ 125 MHz bus, with 32x multi (for 4000 MHz). I just increase multipliers one by one, and run wPrime to see some temps and some basic stability. If it passes, I increase multi again. So here's what I got with the first chip:
I am not using TurboV Core to adjust anything..all voltages are set manually in BIOS.