Have you tried using the Horizontal Regression > Single Element Regression Analysis? This command is intended to create a single geometry element that is a best fit to a set of regression points. Please keep in mind that InRoads does not really like a full loop circle, so you will want to go from a start point to an end point which would be the last point in the list. There will be a slight gap, but you can edit the geometry to adjust the length if desired.
With that being suggested, I don't believe I have ever seen this workflow, so if it doesn't work can you provide a sample of the regression points?
With that being suggested, I don't believe I have ever seen this workflow, so if it doesn't work can you provide a sample of the regression points?