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Picture a hump in the middle and the sides pointing down. Like trying to strop on a snake :<0)

On a table you can get away with more blade pressure because no matter what, the thing is flat. In...

Try to copy what you did at the table. Is the strop curling any or cupping at all. You may need less blade pressure when hanging because the bend in the strop will put more pressure on the edge. Just...