Sweep2 naked edges problems

Hey everyone, wonder if anyone can help me. I modeled a guitar neck a while ago in Rhino 5 and never really noticed the naked edges until I had some issues with my CAM program. I tried to redesign it but continued having the same problems with naked edges. Working on some of the simpler geometries and can’t get the edges of a 2 Rail sweep to match the cross section curves. I just downloaded rhino 7 and getting the same results. After doing a 2 Rail Sweep when I zoom in to the surface edges there are obvious gaps between the curves and the surface. Most likely operator error…

EDGES_EXAMPLE.3dm (57.9 KB)

Hello- this?

image

see
https://wiki.mcneel.com/rhino/meshfaq

-Pascal

that is exactly the issue. My mesh settings are Smooth and slower already.

Thank you