I am sorry that you chose to accept my comments in the worst possible way. I am not attacking you.
The hectic speed of the world today seems to disallow us the patience to meditate on the mysteries of art - we want answers now, and if we can't have answers now, let's just change the question.
I too have been in situations where I can't figure out why a composer wrote someting a certain way, or how I should interpret a phrase that on its surface doesn't make sense. Years ago, I made a similar comment about a Brahms piece, and a great musician said that I didn't like it because I didn't understand it. That comment pissed me off at the time, but I humbled myself and thought about what he said. It was up to me to discover its purpose. The concept of a humble, open mind...
How many recordings of this piece have you heard? How many times have you listened to each one? How many dissertations about the fourth ballade have you read? How many theoretical papers have you studied? How many articles on this piece have you read? Have you performed a Schenkerian analysis on this piece (probably the best way to appreciate it)? How many great musicians and teachers have you discussed this with? How many years have you spent practicing this piece? Have you thought about those chords in relation to not only the fourth ballade itself, but as a statement within all four ballades? How many editions of the ballades have you studied? Have you studied the sketches of the piece?
Whatever your answers are, do more.
Does the above list seem unreasonable? An artist in search of truth wouldn't think so. If you have done all of the above, and still don't understand the passage, then study it some more. The desire to change a passage of a masterpiece because you don't like or understand it is immaturity. You may NEVER understand that section. That's ok. There are some passage that still perplex me, but I still wish to study them. Remember, it's the the journey that makes us grow, not the destination.
"id rather improvise something in this "no go" zone. Isn't that what piano playing is all about?"
No, that's what improvisation is about. "Piano playing" depends on the stlye of music one is playing. Classical music allows for expressive freedom within the bounds of the score. You are wanting to apply jazz and pop principles to classical music.
As DJ said to Matthias, Kresnke, if you asking this question then you aren't artistically mature enough yet to perform this piece; not because you can't play the notes, but because you are apparently unwilling to spend any amount of time studying and discovering the secrets of this piece. You have to accept that the principles of classical music apply to you, too. Sure, you are free to perform any piece as you like, but you will not grow as an artist. In my experience, those passages that I fail to immediately understand become my favorite parts of the piece. Maybe this one will become yours.
Robert Henry