Hi fleetfoot - it looks like you may need to use a few more sections so that the sweep profiles are just a little bit denser.

It looks like you've got just enough space between each one that the profile twists enough until it hit the next one that it gets confused about how to match up the segments between profile. It tries to connect up segments between profiles to minimize distance between them.

Your problem is that right now you've got the wrong segments being matched up. But if you had a bit more profiles there would not be as much rotation happening for each one as it traveled along the path and then tried to match segments so it should help with the segment matching.

- Michael