Use Calibre - try one of your epubs first.
Select it in Calibre, click the "Convert books" icon, and choose to convert from epub to epub. In the 'Look & Feel' tab of the conversion window, change the justification from original to justified in the drop down menu.
You may want to remove any space between paragraphs if you prefer no double spaced paragraphs.
Convert, then transfer to your Sony and check it.
Then you can select all your books and let calibre do the 'conversion'.
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