It's not spiking, that's normal. You just have a slightly below average 2600K on your hands.
These processors increase the *normal/base* voltage independent of the BIOS settings when you clock them past stock. You will find that if you try higher multipliers, the voltage will increase further all by itself. This is a part of turbo boost: the processor is factory programmed with higher boost-voltages at the higher multipliers, that turbo-boost will use automatically.
I have one that can do 4.6 Ghz at 1.36V, which was an offset of +0.005 IIRC. That's because that processor was better then yours - I had two others that were worse. I would also set the Max-Turbo-V to +0.004, that's a good move because otherwise it can be out of your control.
I would set load line to normal or zero, and if you think it will be stable, try more negative offset voltage. -0.01, -0.015, ... until you're happy. The -0.005 attempt is too small to see any change. I don't want to hear about the n00bs recommending against it.
If you try 4.8 GHz for example, you'll see the voltage is almost 1.5V without you adding voltage in the BIOS.