This is one of my favorite pieces, and I used to play it on piano with a little jazz in restaurants to decent effect. It's just a beautiful, well thought-out piece. The counterpoint is perfect and worthy of Bach or Mozart. I wonder if Mozart knew of this piece?
Anyway, your rendition is really quite good. I bet this took some work! A lot of work, actually! Here's a few thoughts . . . most of which you are probably already aware . . . occasionally the cello arpeggio drops out, as in :17.
If you listen to the volume balance between organ and strings around 1:00 - 1:10, I think it's perfect!
For my money, the melody line of the top violins could be louder, check 2:09 and after.
If you look at 4:54, would the pizzicato string plucks would be that much louder that the organ? You might consider bringing the organ up and the pizz down a tad.
OK, one of the cool things is that you can balance any of these exactly as you wish, and as you present it, it's a really great rendition. I think all of your instruments present organically, nothing really screams out as "fake news" !!!
Nice work! Now I'm off to watch "Gallipoli" which is a fine movie that features this piece.
cheers,
-Tom