Multitexuring - a soccer pitch

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siread

Ok, so I have my pitch lines in place but I'm a little concerned by the raggedness of them. The texture i'm using is a 2000x2600 png, with some anti-aliasing on the curved lines. It seems that no matter how big I go, I can't get rid of the noise along the pitch lines. (The pitch itself is a cube 1000x1300 units.)

Take a look...

I have loaded the textures with flags 1+8, and used textureblend 3. What can I do to improve the sharpness of the lines?