Amazingly good, more specifically because of the nature of the music. The Adagio Grazioso is so delicate and the non vibrato playing technique so demanding to have a more or less realistic sound (even with VSL strings) in the historic performance. Even the typical sound of the baroque violins is present (EQ'ing?) I'm a great admiror of the historic performance (in Belgium we have quite a lot of excellent orchestras playing that way - as you have some in Germany too), and we are a bit spoiled with hearing only the utmost best... So what you've realised here is outstanding.
If I'm allowed to give you a hint for the next movement: try to elaborate the continuo part a bit more. In the Adagio it sounds rather dull an uninspired (meaning not creative enough). The ensemble is quite small and the continuo might take part in the musical story a little more, adding some extra embellishment. It can easily be something more than just chords on the fundamental bass, following every bow strike. But of course, that's a matter of interpretation and you are the performer here. Everything is your personal choice.
Apart from that, a very, very great approach with a natural horn at its best! Congratulations!
Max