rms wrote:
I wouldn't bother. They're meant to "prevent" the core from being
crushed due to too much pressure from the heatsink.

You are neglecting the potential additional heat transfer of cpu
heat from the substrate to the heatsink with a copper shim.

Actually, it's the reverse. The substrate has a much higher thermal
resistance compared to copper (or aluminium), so at any particular point on
the substrate, the HSF surface above it has a higher temperature. So you'd
actually be dumping heat back into the substrate, though in any case there
isn't much conduction/convection away from the substrate, so there would be
a negligible performance difference.

[...]

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Michael Brown
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