when you play the theme in the major sections, have you thought about the voicing? For instance, in the first line of the score, the right hand melody is in the middle part, and I can't make up my mind whether you project it enough. Obviously you don't want to overemphasize the line or you risk destroying the mood, which is very good as it currently is.
Have you listened to Helene Grimaud's playing of the piece? I like her a lot usually, but I think she overloads the middle section with passion and gets really loud, while I think this should really be more of an introvert, dream-like passage.