You did get very well the essence of the beggining, that "sotto voce", really expressive and sentimental, dark and obscure but at the same time enchanting, despite of the slow tempo you used.
In the next section, I really think those chromatic ascending octaves need to be faster. The triplet feel was completely lost. When you play that section fast, and legato with almost no pedal (which is what Chopin wrote) there is a truly frantic feeling .... it provides a great contrast.
the DM - as anyone who has attempted this piece is well aware, the DM *is* the piece. You spend 10x the practice time on this section to make the voicing come out right. There are slow versions of this that work- Daniel Barenboim has a real slow DM in his recording of this -- however, his voicing is friggin clear as the day as long, which makes it work. I would highly recommend speeding it up.. but if you just want to play it slowly, really make that melody sing to the point where all the supporting material is played, but is just a whisper.
By the way, I used an online metronome to find the average BPM of the doppio movimento sections of your recording and Rubinstein's.Yours is at dotted quarter = 84 (three notes per beat on 84 bpm)Rubinstein's varies a lot in pulse, probably more due to recording tech than anything else (many other nocturne recordings of his have this problem). The best I could put it at was actually 88. So, really only one metronome click faster!I think part of Rubinstein's image of being faster is his utterly divine balance and singing line which IMO very few pianists have managed to replicate since. But that's just me gushing, haha.
Remember, doppio movimento- double movement!You don't need to take it ridiculously fast, just give it some contrast. Rubinstein IMO has the best approach in terms of speed; not blisteringly fast like many modern pianists do, but gorgeously passionate.