ganymed, I can't tell you much about how I practiced it - and generally I don't think it would be a good idea to pass ideas about practicing or technique in these forums. Many things can be done through the web, but in this case I think confusion is more likely to be the outcome than any real progression. Piano technique is an extremely delicate issue which still requires an intimate one-on-one situation.
Ishay

Sounds good! The opening is too dry for my taste; it doesn't properly set up the mood for the piece.
Your left hand phrasing sounds square to me. Have you ever read James Huneker's book, "Chopin: Man and Music"? This is an interesting book (unpalatable to many, because written in an overblown, Bostonian-Victorian style) in which he talks about most of Chopin's pieces individually.
For this etude, he shows versions of several editions that were published. In those days, famous pianists often made editions of the works that they played, with their own idiosyncratic accentuations, phrasings, pedal markings, fingerings, etc. This doesn't happen anymore, but it happened a lot back then, and a lot of those editions are no longer available.
In any case, he shows the left hand passage from this etude in a few different editions, and the range of accentuations is very surprising. I urge you to look at this, because you approach the left hand in a very literal way, but also in a way that strikes me as square. I think it can be more artistic, more interesting, more
vocal and less literal. I think that about a lot of Chopin performances, though.
Good job!
Walter Ramsey
PS I don;t have the book handy, but when I get to my library, I will type out the exact editions he quotes, and any other relevant information.