Hi mffl and welcome to the forum,
I wondered what the differences were as well, a while back but its pretty straight forward. I haven't done much programming on the pocketbook in recent months so I just recall things from the top of my head...
the e-ink displays have a ghosting effect if you dont flash them first to the inverse colour you want to set. If you run a "fullupdate" it will make a full screen refresh, flashing first mainly black and then to the desired pattern. However, that is rather annoying if you want to have something like a progress bar as in one of my apps.
The differences between soft, fine and dynamic are (without knowing now which is which, but you can easily write a small app to test it): one is without antialiasing, one just flashes the local area black and white and one just doesnt invert the screen at all, leading potentially to ghosting effects.
As I said, this is all from the top of my head. I can look it up when I get home if you still cant figure out which mode to use.
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