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I would try a couple of TNT's first that might take out the chips nice and gently, after that the Zulu with the slurry dilution might fix her right up :) If not then drop down harder on that old...

Just from what you wrote I only see one thing that stands out at all

"It was just refreshed prior with my zulu grey and naniwa 12k. Tried using slurry on the zulu at first and the edge was...