Well, to start, your English is better than 80% of the people I know, so good job!
I am really glad that you enjoyed this Symphony and especially glad to see someone who is also tired of modern music! I like dissonances, but I think people are just getting to lazy or comfortable with them. I liked when dissonance was a nice trick in the Romantic era to add beauty to your piece as I tried to do in the second movement.
As for development issues, I've taken your comments in to perspective. I've been working on development with more recent compositions because I agree that my music could and should see some more of it. I'm taking my first composition class over the summer so hopefully I'll gain some practice!
Thanks so much for your comment, Sebastian!