I'm guessing this is something simple, but I can't figure it out. I'm getting these weird lines on my polygons, as if had hard edges. But as you can see it's in a smoothing group. Here's the smoothing group. And here's a wireframe. I have an issue before with some ugly geometry where a shadow would go across the polygon…
Another thing that could help with those "seams" is to add an extra edge loop to make the really long quads half as long. normalmaps no likey long polygons.