That's puzzling.
The IHS is nickel plated copper (last I checked), so the softest part of the contact is the block's copper baseplate. Copper is "relatively" soft, so I would expect the gouging.
You mentionned that the base and block stick well together (I know the effect you're talking about, no, can't remember the name either). Did you try turning the block around? (especially 90 degrees). That would reveal any warpage.
DangerDen's site says to compress the springs down to 10mm; if you went any further, I'd expect the gouging.
Overall I think you'll be ok.
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