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With thanks to JS Wolf:
When you extract the files from the ePub, do not extract META-INF and metadata. Leave those alone. Then when you put back the rest of the files, the ePub will be compressed correctly (if it was correct before you extracted any of the contents).
From another source:
Create a new, empty folder with the title of your book as its name, no spaces, all lowercase is best.
Zip the empty folder. You now have an empty zip folder.
Now you’ll put the pieces of the epub into it, in the right order:
First, drag and drop the mimetype file into the zip folder.
Next, add the META-INF and the OEBPS folders (you can drag both into the folder at once, their order doesn’t matter, as long as the mimetype file is first).
Finally, change the .zip extension on your compressed folder to .epub.
So order and compression matter.
You could use Sigil, import the new ones with their new names, change the links, then delete the big ones then save. 2.8 meg isn't really so big for a book. If the epub is displayed on something with a bigger screen, the images might look better, though managing it so they don't overrun your Sony and still look good on a bigger screen can take some doing.
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