I have listened to the "Widmung". I really like these arrangements of the Songs of "Myrthen", op. 25, by Clara Schumann and I have played some of them, too. You play it absolutely properly, may be here and there you could think about the little dotted rhythm in the chords of accompaniment, but that´s no big deal (no reason for to re-record it IMHO).
By the way, which film about Clara Schumann have you seen? Was it the one with Nastasja Kinski? I have visited the Schumann-house in Leipzig some month ago and it was impressive to see that environment Schumann has created some of his works during four years (1840-44). Also the book "Schumanns Schatten" by Peter Härtling was a very interesting lecture, but I don´t know, if it´s translated into English.
Yes, I have heard it sung. But I like playing it in a more introspective manner, which makes it more tender and romantic. Playing it like it is sung makes it sound so German!
I really couldn´t recommend to a half or quarter german or so to make it sound German, that would be too boring!
You just gave me a new advertising angle for piano students. "Learn the piano and loose weight." Maybe I can even get a regular show on PBS.
But don´t take me as an example for garantueed success!