John,
This is in Acrylic using an image stroke. If I was using a pen, I could get a variation. This is creating a constant width, and then editing the width with shape nodes. That is a separate tool. The tool goes in the same direction regardless of path direction. I one case, the adjustment is backwards. I am not sure how to get a smooth shape. I have been thinking it has to do with the path itself because there didn't seem a way to change the shaping nodes.
Rich
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