Thanks @Odedta,
your solution seems to work for Readium and for ibooks in Ipad, but it does not works for Ibooks in osx. As I had experienced before, and as @JSWolf points out, ibooks does not seem to totally conform to the standard. I will though go with this solution and hope that they do conform with some future update.
As for the viewport resolution, I had set it to 600x900 but I see that yours is much bigger, is there any reason by which I should use a higher resolution in this particular case?
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