Hi Justin - I think this is great. The clarinet part has a wonderful mix of virtuosity and lyricism, the piano part (and its interactions with the clarinet) is well-developed, and the harmonic changes and large-scale tension are handled expertly.
You obviously know what you're doing, so please take my criticisms/suggestions with a grain of salt.
As to where to go next, if it were me, I would ask myself: What do you want the "shape" of the recap to be? (Do you want the end of the development to be the emotional climax of the piece, or do you want to build all the way to the coda?) What should the character of the ending be (or, if you're thinking like Beethoven, which theme should be "triumphant"? You have such a big contrast between your first and 2nd themes, maybe you could exploit it more in the final section).
One thing I would definitely get rid of, though, is the resolution at m. 360 (unless you want the movement to end within the next 10 measures). Otherwise, if you want to go on, you'll have to restart both the rhythmic and harmonic energy from scratch, and this can be difficult to do so late in the piece without losing the listener's attention. The piano part builds so nicely through most of the recap of Theme 2... what if you kept that energy going to transition into a more driving, climactic section instead of coming back down so soon (around m. 351)?
I like the variety of harmonic ideas and characters in the movement (e.g. the contrast the 2nd theme provides--please keep it!) and I think you handle the transitions between them very well for the most part. A few of them seemed a little abrupt to me, though (off the top of my head, m. 183 and its counterpart at m. 314). I think this is just because you're resolving to tonic triads prematurely here, and it feels like you're interrupting the tension of the surrounding sections. Even just replacing chords like these with less-resolved ones would improve the flow, I think.
That's a lot of words for relatively minor suggestions. It's very professionally written and would be a rewarding challenge for good performers... I hope you finish it and share the other movements here!