I used to have problems with fitting clampmaped textures. Sometime ago, i discovered a workaround for this. I want to share this information:
Follow the steps to fit a clampmapped texture for tcmod rotate or some other usage:
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Draw a brush which has its bottom left edge on the 0,0,0. (or take the brush to that location)
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Fit the texture
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Set the horizontal and vertical shift values to zero from the surface inspector window.
Now , your brush is ready to be moved anywhere unless you dont modify the values in surface inspector window.