This is one of the greatest achievements I've ever gotten so far.

After over 20 tries at 5:30am, I finally FCed Karakuri Pierrot on extreme. The trick was me trying to FC Romeo on extreme by increasing the note speed from 9.3 to 9.7 but kept missing one note at the end. Soon got tired of retrying on Romeo and skipped to Karakuri Pierrot and I got it at 9.7 note speed...not the normal speed I play on.