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I haven't done plastic in forever but it sounds like the drill attachment/use is the problem, over heating the plastic. 1500 rpm sounds really high to me. You can do plastic by hand, just be patient and keep everything lubed with compound (or water for sanding steps). Too dry on the sandpaper will also cause issues, grinding in stuff you've removed. Working under a light stream of running water is ideal.
Also, you only need to step back one grit usually. If that's not cutting enough, try one more. Patience is the key.
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