My suggestion would be to play it slower for about a week... MUCH slower, maybe 4 times slower than you play it now, paying very close attention to every note, including what you would like to do with that note. In other words, with full dynamics and articulation, doing exactly the interpretation that lives in your head, perfectly, but very very slowly. Then try it again at whatever speed you like. Practicing against the clock, trying to play faster and faster will result only in more and more mistakes.
Ariel