why the rudder wiggles:
I posted this as a new thread, but also want to cover it here...I hope you will respond both places:
---
I don't think it is anything to do with crosswinds. I think when the throttles are idled the engines don't come down at the same rate...perhaps the angle of the pilots hand not quite pulling throttles back.
anyway, the throttles and engines not coming back at the same instant (whether mechanical, electronic, or by hand) the plane wanders due to the assymetric thrust...then the pilot has to do a dance on the rudder pedals to keep the nose straight.
no proof, just a guess...I've seen pilots in other planes not retard engines/throttles and have to use rudder subconsciously to keep her going straight.