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When using a honing surface that's not as wide as the blade I don't think having to spend some additional time on the parts that don't stay in contact with the honing surface for the entire stroke is...

When you use the Norton, do the heel and tip leave the hone surface?

If so, this may be the cause.

I'm NOT an expert, but I keep playing with my barber's hones - none of which is more than 2"...