You might want to check a few things before proceeding:
- Take the chuck apart and make sure everything--especially the scroll--are clean and oiled. A chip caught in there could be causing the problem.
- Make sure that it's out across the range. Clamp a variety of diameters to verify this. I've seen chucks where the scroll was the problem and it was out more in some diameters than others.
After that, yes, a friend did the very thing you're talking about. He clamped a hand die grinder on his toolpost, spun it up, then went inside and kissed the faces of his jaws as the chuck was spinning. Of course, this made a grinding mess that he had to be careful to clean up but, it did the job.