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There should be no "bad spots" or "sweet spots" on the hone. It should be uniform. I would give it one last heavy duty lapping, get some serious stock removal, and then if it is still bad then...

You have lapped and used this hone and it still feels coarser than a 1K. Hmm... See if there is anyone near you that you can compare hones with. If it is bad call the Norton customer service and ask...