Ngon plugin diamond mesh seam

Hello all,
I’m getting started using Ngon plugin for some space frame designs, and I was trying to use the diamond mesh w “clear ngons” to get a triangular meshing (trying to get close to equilateral triangles by using Kangaroo solver down the line. I don’t want the truncated triangles at the boundaries, so I’ve selected -1 for the boundary condition. However, that gives me this result:

How can I retain faces at the seam?

Gives me these results down the line:

Move to Rhino for Windows category