A minor comment -- well, two. I should note that that particular Nocturne is one of my staple rep. pieces, and has been for years -- it is lovely. First, I no longer even try to play all 22 of those notes; I had a stupid accident a couple of years back, and there is no way I can play them. Not happening. I've simplified it, and only the critics with scores ever notice.
However, on that -- and this is a more general comment, as Chopin particularly but others as well wrote these things -- it isn't really meant to be played mechanically perfectly. Rather you have a steady flowing pulse in the left hand -- maybe a bit of flex in it, but not much -- and the right hand is intended to play this lovely flowing bit of filigree over it. The idea is to get that filigree to be really flowing and flexible, and to do that I at least had to practice it all by itself until the fingers just did it, seemingly on their own. From there it is simple -- just make sure that it starts and ends where it should, and don't even think about trying to get each note to take up exactly 1/22 of the time!