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This is a known issue with Nortons & may need some serious lapping but is fixable. Some times the 4k side needs work too.

http://straightrazorpalace.com/hones/83838-norton-8k-problems.html

Agree with all that 8k has to be good first but depends on how you define "buttery". ;) An $80 finisher would be an easy choice for me. It's the $800 Jnats you might not be able to justify.