No, thats perfect! I appreciate you critic.
Regarding No 20...
I dont think I was too heavy at the start. Thats just the piano, it sounds nasty above forte! And the mic set up doesnt help. I wasnt hitting those chords as heavily as they sound, trust me.
I think you are right.... also my speakers are bad (pc speakers).
One suggestion with the pp. Have you considered the soft pedal? Try it and see if you get a sound you like.
BTW I'm not a teacher, so if a teacher comes along to critique, in contrary to what i say, ignore me and believe him/her. Also you should get a teacher

I remembered some questions that helped me with the interpretation of no. 4... I think you might find these interesting as well, if you haven't already encoutered them.
1. There is a single "arrival point" in the piece. Where is this and why?
2. The piece is very much about creating, holding and releasing tension. In which bars are you doing any of the three things mentioned here? how does chopin do this with the composition? How can you emphasise this in the sound?
3. Another way to think about this piece is with movement and stillness. He plays alot around here with this concept, some parts seem to require that you move to create or emphasize the moving current, and some parts require a tranquille sad stillness. Which bar implies movement and which bars stillness and why?
4. What is the role of the last three chords? why did he stick them in? What do they mean to you?
5. if you were someone telling a story through the music, what would the story be?