Knit does change surfaces a bit, but I am surprised that it made the change shown in your pictures. Are you still on SW2009, or is your profile not quite up to date? Can you adjust the knitting tolerance? If you can, you might try cranking it as small as it will go.
I don't trust the curvature disply an awful lot. (I don't even trust the Draft Analysis.) I would trust the intersection curves and the comb lines more.
What kind of surface finish are your parts going to have? If you are going for a mirror finish, then you might have problems. If you are going for a heavily textured finish then you probably won't. Try looking at with RealView, using Strip Lighting or Grill Lighting, or just use Zebra Stripes.