How to improve in the middle section of Chopin's Etude op 10 no 3?

[faa2010]

Hi, since last year, I started to learn, practice and play Chopin's Etude op 10 no 3. My advance was great, but after I took out the metronome and I wanted to play faster, the middle section has become a disaster. I can play it at 145 bpm per octave with no problem, but once I play the thirds and the sixths, my fingers slip or I play the wrong notes once I jump to play the intervals (specially the right hand). Also in general, I need to focus because if my mind wanders around other things, either I forgot what it is next to play or where I am.

Is there a strategy or a plan so I can play faster and accurate at the same time the middle section?

BTW, I was thinking in playing the Etude op 10 no 1 (of course, slow), can that Etude help me to improve?, or what can I improve and learn from this piece?

Thanks for your advice.