I would check out Bookari. You have full control over horizontal and vertical margins. OPDS support. It syncs reading position between 2 devices (Android or iOS) with 80Mb storage for free, and they offer inexpensive cloud storage for as little as $10/yr (includes annotation sync, for 4 devices, 1GB storage). PDF support is nice too, auto-cropping etc. Supports Adobe DRM. TTS on both iOS and Android. ePub3 support.
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