I just did another run and I have some thoughts.
In no real particular order:
I feel like there are so many possible routes the story can go. I like brainstorming but at the same time I worry that if I do too much then when the real story unfolds, I might be disappointed if it doesn't happen the way I thought it might. One of the reasons I'm glad I'm still unsure about a lot of things in the story is that it keeps me from locking in my ideas too firmly and risking that disappointment. I believe in Caribdis though, the story and characters are great so far so whatever happens I don't think it could disappoint.