Hi! I've also taken this scherzo up again. The biggest problem is the last arpeggio up and down before the reprise and before the middle section. I wonder if anyone plays it with the r.h. alone. To get the force and sound in each note, I have to divide it between two hands. The arpeggios before, I don't find any difficulty. The other hard part is the second part of the central section. I have to remember to keep the hand relaxed - a continuous articulation with no tensing up. But this is a technique that needs to be acquired with lots of slow work. I can't explain it to you. But remember, when you stretch for those notes in the passages you were talking about just before the reprise, your hand has to bound back into a relaxed "holding-a-ball-in-the-hand" position.