Thanks for your helpful reply! The book does have four graphics, so that may explain why -C2 doesn't reduce the .mobi file size all that much (from 977KB using C1 to 910KB using C2).
When I email the .mobi file to Amazon for conversion, the .azw file comes back to me at 464KB. I'm guessing that's because the source files were stripped from the .mobi, but I don't really know. Thanks again!
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