Technically sound. Very accurate and precise, impressive.
I could do with a bit more speed in the beginning. Don't want listeners to fall asleep. You must find the balance between drama and monotony. Something to pay more attention to, I think, are the common Rachmaninov elements of Bells and Wind. While the piece is solid note-wise, I think now it is time to work on your interpretation of it. Rather than playing it cold, try to get into the composer's head. The way I think of the first octaves are as cannon fire. It could be the end of a war, or a 3-gun salute at a funeral. Then the church bells begin, lamenting the dead (war/funeral = death). Really bring out the lower octaves; they are where the melody lies. When faced with the longer groups of eight-note chords (I think you'll know what I'm referring to, I don't have a score in front of me right now), a little more speed is desirable. Remember they are of equal value to the 3 eight-notes that follow each melody octave in the beginning.
Now, the middle passage. I believe it is marked Agitato. Rubato is acceptable, but always the tempo must be building until the climax, which then leads back to the original melody. Don't be afraid to really put your weight into the four-finger chords in the final section. The dynamic is suggested at ff or fff. Play it that way, don't hold back. Also, I have studied Rachmaninov's own recording, and he goes for more speed than the first section, althoughhe wrote it as "Tempo I." Finally, remember the bells, especially as the song winds down. Take your time with the final chords and really let it sing.