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If i remember correctly the 8k side is somewhat like an orange skin surface, that all needs to be lapped out, should be very smooth and even.

If your tile is flat you can check with a straight edge or square, i would say keep going until its completely even, is the stone flat? Some have said that the newer Norton needs more lapping on the...

Is this on the 4k side or 8k?

Sounds like it needs more lapping, did you make a pencil grid on the stone and completely removed it? might have to do this twice.
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