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You can do an epub to epub conversion if you want to use calibre to make the changes.
Alternatively to strip the metadata jacket, you can use the Modify ePub plugin. It might also be the case that if you set your default conversion settings to preserve the aspect ratio, that using the "Update metadata" option of Modify ePub will also do that second issue for you.
Otherwise you will have to edit the epub manually. You can either do this by using Tweak ePub on the right-click menu (hit T), or use the Open With plugin and install Sigil.
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