The Schubert seems to me a good opening piece after interval. It's heavy going for the audience, intense and demanding, so not such a good finish. Depends a bit on your encore(s), but I think something lighter to send 'em packing is better.
I'd open with the Tempest, then the Ballade (or vice versa - I'm in two minds), interval, Schubert and finish with the Ham-Pag.