Thanks for the responses.
I got the reports for each Epub (had to zip them to upload it here, so do tell me whether or not they unzip ok). The file with the Number 1 in the filename is the book from months ago (84 pages, 21 mb), and the one with the Number 2 is the newer one (64 pages, 29 mb). If these don't provide enough information, I will just send the entire files across.
If it really is because of the image file sizes, as far as compressing goes, I don't quite see why the file sizes would be this much larger even after I'd compressed them. No compressors I've used can shrink these images down any more than they already have been.
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