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Since the material seems to consist of mainly images, and you have problems rescaling them, epub may not be a good format. Try pdf instead. Or a comic book format.
There could be some other weird formatting tricks in the books that cause your problems. A detailed analysis in Sigil should reveal this and allow you to remove such formatting. As I understand it somtimes ebooks are designed specifically for only one device with fixed layout, and it may then be difficult to convert that book to other devices. Could that be the case here? Perhaps your problems are intentional from the publisher to discourage conversion to other platforms and possible mass piracy? Or the publisher never intended the books to be used on any other platform other than apple.
That said I have never had any problems with images in epubs if I use the correct output profile. But I have limited experience from different devices.
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