Well, if you chill the water so that the CPU is at the same temperature as the motherboard in the socket area, and you insulate as per a TEC to eliminate convection, secondary paths should at least be substantially reduced.
Running a program that stays in the CPU cache without RAM access will minimize Vcore power dissipation occurring in locations outside the CPU.
It seems to me that the biggest problem by far, is getting a trustworthy current measurement.
Can you identify the manufacturer and part number for the Vcore regulator IC on your motherboard? Maybe looking at the datasheet for it will give me some idea how to measure the current accurately.
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