Set CPU LLC to HIGH instead of very high. causes a lot of unnecessary spiking of temps and voltage.
Temporarily set cpu vcore to 1.5, and do a little stress testing, bringing it down, hopefully to around 1.475 or lower.
Your motherboard should offer 450kHz vrm, well, my brothers saber does (not sure if its a REV 2.0 liek yours)
NB 1.8v can be set to default 1.8, only heavy chipset over voltages require a higher 1.8 due to voltage sag (many share same SOURCE, hence why balancing is sometimes necessary).
NB HT voltage looks fine.
With 2600mhz northbridge clock, Id say cpu-nb voltage should be closer to 1.3, but if it is stable, than you can leave it. Bump it a hair upwards if unsure. This voltage stabilizes a lot of things. northbridge frequency, ram, and core overclocks. (faster northrbidge means talking with both ram and cores faster, hence higher requirement)
I have had to bump cpu-nb in past PURELY on core overclocks alone, even with a 2200mhz NB and 1333mhz ram. It is one of the many reasons why many OC guides recommend one component at a time for testing, outside the obvious limiting of variables
Ultimately, Id recommend starting purely with lowering LLC to high, and figuring out the new required vcore. Your idle voltage will be higher no matter what, but you want the LOAD voltage to be near idle voltage, or a little lower. vdroop under load means you can dial in exactly what you NEED, while still maintaining stable idle voltage.
Very High LLC means idle voltage is much lower than load, and can lead to very random instability, as spikes of activity can cause a lock up or reboot.