Yo, I wish I had a more scientific way to measure these for you:
It's weird we think alike, but from what I seen, Fujipoly doesn't have a high quality pad at 2mm:
I actually tried stacking them, but the performance vs the Ziitek pads on the front wasn't.. mind blowing. Ziitek makes 11 W/ mk pads, and so the pads you have might be good, who knows.
I think next time I would just go with the brand that makes a 2mm. Fyi the pad behind the GPU is shorter.
Hope that helps