Certainly the other comments in this thread should help you. A mobi file of 160K is not a large file. It should be fine. As to the ePub, the Calibre edit command or a copy of Sigil (a free download) can be used to edit the ePub and replace the pictures with higher resolution versions pretty easily from your originals. A fixed layout format depends solely on a very few readers that can read that format and are generally a lot more work. You are better off with just letting the pages appear as you will likely get 1 per page anyway or you could force page breaks if you really need to.
Dale
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