HiThe best thing to do is to keep your hand in a normal relaxed playing position and uses your fingers to lead you up and down the arpeggios.
A horrible suggestion.I don't have time right now to go in-depth on this piece, but the F6 you speak of in the second phrase is the only arpeggio in the piece where I use a lateral movement of the wrist. Everyhere else it's wrist up every beat on the way up and straight rotation (turning a door knob) on the way down.
I read this post on PF about taking out most of the notes and then thinking of it as some sort of movement going up and then hitting four notes going down... I can't remember where... but it would be wise of you to seek that particular thread...