Jagged edges on Delaunay mesh for topography surface

I am trying to create a topo surface using a Delaunay mesh and for the most part it is accurate and doing what it should. However where the topography contours form a retaining wall on the site the mesh forms these jagged edges as shown in the attached image. Is there a way to square off or smooth the edge conditions of the mesh at these places?

Site Topography.3dm (8.5 MB)

Site Topography.gh (6.2 KB) Site Topography R6.3dm (2.3 MB)