I’m a little surprised that it’s so difficult to get a ramp that isn’t “wonky”, though again, I believe the dimensions and small radius value of the inner circles play a role.
I rewrote the gray group to reliably generate a figure 8 base curve based on a plane, and ‘Apart’ slider (182.5 units between center points) and two radii.
Then rewrote the yellow group to implement a smoother bank angle. As you can see by the curvature graphs (dark gray group at the bottom), they look better using small values of ‘Count’ but are more accurate in top view using a minimum value of 21 (which yields 22 pFrames).
ramp_2023_Aug18c.gh (42.4 KB)
Oh 
So the easing I did of slope and bank angle at both ends of the ramp aren’t necessary?