An update, some definite success.

Removed, sanded, and repainted the pressure plate. I tell you in all honesty, the world is full of dust. It's everywhere, but most of it seems to be centered in my garage. So, *sigh* the paint dried with some dust in it. It still felt pretty smooth, so I popped it back in and did some tests. Looks good! I am now debating whether to leave well enough alone, or try and remove the paint once more and try for a cleaner application...