Hi Marik1,
Youthful performance or not, your playing was outstanding. Schubert, of course, was a transitional composer straddling the Viennese Classical style and the Romantic Age. But in this piece I believe that his vision was transformational as he leaned more than ever toward romanticism. This music demands so much technically and musically, including playing Schubert's heavy "orchestration", some virtuoso octave technique, voicing the big chords, bringing out the voice leading, phrasing the motifs--plus, well, stamina. For me it was very convincing indeed.
David