After reading all of the other comments, here are my thoughts:
Just having been overhauled does not insure that it was put together correctly. It was put together by a human, and humans do occasionally make mistakes. Like not checking for the proper ring size. Like having all of the ring gaps lined up. Like not having a proper hone finish in the cylinder bore. There could also be issues with valve stem seals.
Regarding using any abrasives, I would say use extreme caution. While they may aid in seating the rings more quickly, they may also linger and cause premature wear of the rings/pistons/bores. So, once you put them in, how long does it take to get rid of them?
For diagnosis, I might suggest that you do a leakdown test before taking anything apart. That would help to either prove or disprove a ring problem.
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