Repeatability may not be affected SO much because the source of the variability is presumably the thermal paste application (and how it spreads out of the interface when you tighten it down). I would assume that slightly off-flat wb mounting will result in a different final interface (and performance) than a perfectly aligned mount regardless of the pressure you use. That's separate from the force you apply in other words. By taking great care in how I do things I can generally get to within 0.2C dT of my best mount pretty consistently even with ~30 lb force.
You would really stack the deck against wbs that use the socket lugs or anything other than 4 hole mounting by cranking the springs down on the 4 hole blocks to far past specs while the other blocks are fixed at the mfgr-supplied "safe?" settings. I don't think you could put the same springs on a block that uses the lugs without shearing them from the socket...
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