Bone Beige or Sculpt are my go-to contouring shades. For a more dramatic effect, you can try Shadowy. I love those three shades for NW complexions as they are neutral-to-cool rather than warm based (as most bronzers are).
I find MSFN in Medium Plus a bit light for a NW15 contouring, but if you are looking for a very subtle contour, it can do the trick.Bone beige, sculpt or (depending on how you want to use it) MSFN in Medium Plus. Love it!