Hmm. I would say that you assume your storyform is correct until you have evidence (from your actual story) that suggests it’s not.
Then you can either keep writing and only use the parts you still think are correct (e.g. you might remain certain of the Resolve and throughline Domains). Or you can go back and try to find the right storyform. But you should probably give yourself a time limit for the latter.
I would tend to wait for “positive” rather than “negative” evidence – like “OMG this is so cool, I bet the OS Problem is actually Equity, that makes so much sense!” Rather than “oh, what gives, I thought the MC Direction was Ability but this looks like Desire”. When you get into the heads of the characters, as you must do to write, a lot of things get all skewed.
One thing, if you notice your story is really weak in some area, like missing a throughline, that might make it impossible to find a single storyform. In that case you might be better off making notes on how you could improve the missing piece, and then proceed writing the draft as if you had already written it that way. After a while of writing as if you had it right from the start, maybe the storyform will start to become clear.
Also, since the storyform really boils down to a message, the meaning of the story, it might actually be a good thing if you get it wrong initially. I truly believe that if you set out to say one thing, but the story ends up saying something else, that “something else” will probably be deeper and more meaningful. (The tricky thing is to fix it on revision and make sure everything works with the new meaning.)
