most likely the rings for some reason ever seated, and at this point most likely wont.
dumping an abrasive down the intake is an old skool idea that was reportedly used to try and get chrome rings to seat. I never heard of any success, just the stories of how to do it.
I would not even suggest thinking about it with moly rings.
It is possible that the rings were installed upside down or the assembler "rolled" the rings on to the pistons which puts a radial twist in the rings
I would suggest doing a cylinder leak down test to verify.
http://www.meyerracingonline.com/leak.html