How much various storypoints are emphasized in a given story is a story-telling concern, not a storyforming one. In other words, the storyform itself does not dictate how much emphasis should be placed on any of its storypoints, it only tells you what all the storypoints are. How much you emphasize the forewarnings or the requirements is up to you, regardless of whether the story is success or failure.
Obviously, emphasizing either the requirements or the forewarnings will have different effects on the story you're telling, but it's hard to predict exactly what those effects will be since emphasis is subjective. As a general rule, I would say that since the requirements are linked with the goal, and the forewarnings are linked with the story consequences, emphasizing the requirements centers the goal in the audience's mind, while emphasizing the forewarnings center the consequences. In the first, you're more focused on the potential reward of success, whereas in the latter, you're more focused on the risks of failure.
Which you choose to emphasize will interact with the story outcome. If your audience spends the whole time fearing failure, only to succeed in the end, that's a different experience then having them fearing failure . . . only to fail. What mood do you want to create with your story?
As for the other part of your question, in a change/failure story, this means that the MC employed their solution element. If the judgement is good, then evidently, you (as the author) view this change as a positive thing. Whether this change happened because of the CF/UA, it's not set in stone (at least as far as I know).