I have only played the third Scherzo.It begins by outlining a descending chromatic tetrachord in d minor. This tetrachord is a hystorical symbol of death.
Also, for the trio, the pros don't play it in time--they start the downward cascades late and play them faster than tempo. The downward cascades are very hard and frustrating till you get the hang of them.
about the first chopin scherzo - it was dedicated to a pupil - adele de furstenstin - and really became the first of it's kind. an independent virtuoso form. not having to be found in a sonata or symphony. i found this info on a CD and so believe from reading this that the term 'scherzo' can also refer to a form? chopin being the first to develop this idea.
alistair, i enjoyed reading what you wrote a lot and wish i had time to compare the passages you mention right now. time is of the essence. do you suppose next time you could write as if you were writing for a magazine and include the excerpts of the music?