When you thickness, especially with an oily wood, don't feed the wood with the grain perpendicular to the roller. Angling it even a little bit helps a lot to reduce lines of resin burning on to the belt (how far you can angle depends on the width or the sander). Then reverse the angle to the other side with each pass, so you are cross-cutting the previous sanding scratches. Then I do just my final, light pass with the grain perpendicular so the scratches will be parallel to the grain.
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"Still a man hears what he wants to hear, and disregards the rest."
--Paul Simon
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