You're talking about one of those treacherous, dangerous openings in the repertoire.
Practice in rhythms, in groups of threes, sixes, and placing accents in different places. Practice creatively, and be patient - you'll get it.
One more thing - in general, never try to imitate anyone else's speed, touch, sound - it's the worst thing you can do, with disasterous results always. Try to have your own idea and conception of how it should sound, how fast and loud, and then go for that, instead of trying to sound like Kissin, or Arrau, or Bolet etc. Use your own imaginiation, think poetically, and you'll be much better off than copying anyone.