Hey Don.
I see you were using 2 different profiles for the sweep.. Yes, when i used the tangent circle construction method, with 2 different profiles for the sweep, i get the little wiggle also.. The wiggle happened at the segment points of the curves and caused the sweep to pause and twsit on itself..
I fixed this with the original construction curves by running "rebuild" on that curve at a .001 tolerance to remove that segmented area and then the sweep followed the path well..
Sounds like you switched methods and got results already... This is FYI.
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