You do not really want to go above 600-800 grit if you plan on using thermal compound. This removes any irregularity or lack of flatness, but still allows the thermal paste to interface well.
I think lapping has been taken a bit far, with people thinking that mirror finish is necessary etc. when the main aim of lapping is to get rid of any bow or irregularities in the heatsink.
Mirror finish is not best.
They should also not be using anything on the surface after lapping really.
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