Part of this sounds good, but it's strange that the audio is so, shall we say, challenged. Is that because of the desire to deliver the video fast over the internet, so just basic audio will do? What are the video players that support good audio? They may require a longer download, but they would give us a better representation of what was played.
The dynamics in the concerto don't sound quite expressive enough for a song like that, and the octave below middle-C sounds kinda. . .nasty. You should try another pass using a good convolution sample to soften it and give it body, and it should blend in with the orchestra quite a bit better, too. Good playing, though.