Network creat on_brep will warping

test.rar (1.3 MB)
has a test 3dm file,which have a mesh, and some curves,these curves created using a function writted myself.then I using these curves creat a surface using network command.
but this face is not smoth and warped.
how can I make the surface become smoth and not warped

Its pretty clear that the hightlighted curves are causing the valley>

Perhaps is the “gap” between them at the bottom was not so large, or if the curve were to go more in the same direction, then the result would look better. I might modify the left-most curve do is does not sweep so much towards the toe.