Acrobat 7.0.9: Optimizing PDF increases file size?

Audit Space Usage in the Optimize dialog shows "Color Spaces" ballooning from 0.8 MB to 22 MB when a PDF is optimized (goes from 3% of the file size to 58%). File size increases from 23.8 MB to 35.6 MB.
What exactly is happening, and how can I fix it?
Thanks for any info.

Hey, Jon
Interesting...
Original file (300 dpi CMYK images) 23.8 MB
Images 19 MB
Color Spaces 0.8 MB
Optimize with flattening (72 dpi images, low quality) 68.7 MB
Images 49 MB
Color Spaces 18 MB
Optimize without flattening (72 dpi images, low quality) 68.2 MB
Images 48 MB
Color Spaces 18 MB
Not sure why color spaces are down to 18 MB from 22 MB, I used a preset that I THOUGHT was the same one I used yesterday. Regardless, it's bizarre that both images and color spaces are getting huge when optimized.
I used Create PDF from Multiple Files to bring in a bunch of pages, but I'm reasonably sure that all those files were already flattened before I brought them in.
I'll file that transparency tip for next time though, you never know when it might come up.
Thanks.

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