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I don't have a bad PHIG, so I can't give you a specific example on determining a flawed one.
I can say, don't let any 1 or 2 razors label a stone as a failure.
I have yet to find a bad hone/stone;...

I have 2 PHIG's, they are great finishers on some of my razors.

They are hard; I lapped them first with a DMT 325 , under slow running watter, progressed up through 320, 600, 1500, 3M Wet/Dry...