I just listened to Yunchan Lim play this piece and he REALLY plays it fast - I think the point isn't how fast you play but how fast you play WITH EASE. Even though Yunchan plays it super fast he always seems comfortable with the speed - you should play it as fast as you can play while maintaining a sense of ease and comfort. If you aren't comfortable with the speed or are nervous you lose STABILITY and it makes the listener nervous as well. If the speed at which you play is so fast that you lose stability, you should play it slower until you reach the point of comfort and stability. Anyway you were great !!! I wish I could play half as good as you ^_^