Hi Andy,
Try setting your run execution to manual instead of automatic. I would recommend doing this for any other graph as well.
After that try setting your lacing on Curve.PointAtParameter to Cross Product. Dynamo 2.0 seems to work a little different with the lacing when compared to 1.3, whereas in 1.3 you could set it to longest and get the same result.
Here’s the result I get with an extra duct (then you can clearly see the required ListOfPoints per duct) and the lacing set to cross product.
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