Your first mistake was using IBT for only 5 runs with EIGHT threads selected. Auto makes the core load jump all over the place, where manually selecting thread count keeps the cores at 100% for the whole of the test.
You could not know offcourse but I always used 8 manually and not Auto. It is the first time I disabled HT and therefor it only shows 4 cores I guess so to be sure I did that test on Auto
--> Now it's back Enabled (HT)
Offset voltage is where you use the VID the chip is reporting to the motherboard as your baseline vcore. From there you "offset" it by a certain amount. This allows the vcore to drop down when the chip isn't under much load, and it will dynamically raise it when it needs it. This is different then an auto vcore setting because you have much more control over it.
However, because you didn't know what this is I'm going to guess that you are using a manually set vcore.
Hmmm... I understand it, but I don't get it. (as in: I understand it, I can read it. But I don't get it, I'm Belgian/speaking Dutch/Flemisch... Don't understand it grammar stuff...) Get it
Anyway I did set the Voltage myself in the BIOS. And I raise the voltage myself if needed etc... But is LLC not the same thing you discribe?... (Here prolly comes the I don't get it part again, sorry if so...)
Maybe I just keep it simple... I save the standaard settings in the BIOS overclock profile 1 for folding and save the overclocked settings of 5.0GHz into overclock profile 2. So when done gaming, reboot, load bios profile 2, fold