I've been using iBooks and Marvin on my iPhone 6+ with no problem, except that it's not practical for one-hand using. Turning pages is OK, but reaching the home button always feels like a complicated and dangerous maneuver.
But on the other hand I don't have the same requirements as you. I've never been bothered by the large margins on iBooks for example. So I'm not sure how useful my feedback will be.
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