this is the fourth bar of the piece I am working on.
I already play the whole piece, but trying to finalize it I am working on small pieces at time.
Hanging around here I learned that the best method is -instead of repeating the entire piece- repeat and study just few pieces of it, the smaller the better.
I tried to to this today and I believe that after 30 mins I am still there, or even worse.
When I play the bar with RH, LH, or HT slow, there is no problem.
WHen I play HT at right speed or a bit faster, I f*** it up. My explanation is fingering. Hands do the same thing, but with different fingers and I am not able to keep the right independence.
I wish I took a video, just to understand how to -rather to solve this specific problem- study with the right method.

My fingering: right hand goes 31-42-31-21 (instead of the written 53)
left hand I do 24-13-24-35
I think at this point I should change this fingering because I dont go anywhere with this. What is the right approach?
thanks in advance