Use jbig2 compression
I tried out Velocraptor on a ~13MB ~300 page google book PDF. The resulting PDF is 180MB. I looked for ways to compress it back down, and while I didn't find a good/cheap solution, I think the deal is that Google seems to be using jbig2 compression, and you seem to be using deflate.
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anonymous
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I (maybe foolishly) render the PDFs using Cocoa's PDF writing, which doesn't seem to give me any compression options. Ideally I'd like to copy, and then add to the current file where already have a PDF, but I'll have to understand PDFs a bit better first.