...this recording is already quite concert-worthy IMO...
Just some personal preferences...those octaves in the beginning that precede the build-up towards the main theme (A major), I like them sharper in rhythm. In other words, slightly longer rests and sharper 8th note in the 3rd beat. And the main theme sometimes sound a bit too dry, but maybe it's just the piano/room/recorder.
The tempo is a very interesting question indeed. I agree with birba here - I think it's best if you don't play it as fast. That is not to say that you don't play it well at this speed (incidentally, it seems you have excellent technical command of this piece), but I do think that the way you approach it begs for a more elegant tempo, because many of the things you are doing in the main theme (sorry, that's as far as I get to hear at the moment) are indeed elegant. To add curiosity to the matter, the best live performance I've heard of this piece is Stephen Hough's, who played it at absolute breakneck speed!
Regardless, this is really a concert-worthy performance. Bravo!