Honestly, 600-grade paper, used properly, leads to good results. Not mirror yet but nearly.
To get further if you cant find 1200-grade, try lapping with an abrasive paste. If my memory is correct Dremel makes such a paste which goes with special 'wool' tools.
Lapping the p4 heat spreader: since it IS possible without taking any risk, i'd do it, definitely. Just to correct surface geometry.
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