While it's in NURBS, try upping the tesselation values in the attribute editor to like 15 or so and see if that helps with the faceting. The "broken seam" problem seems to happen alot with NURBS modeling....to fix I usually convert to poly and start splitting and merging vertices (making sure that the two surfaces have matching vertices or edges). If you want to keep in NURBS, then I'm not quite sure what else to tell you.