I think any OS Domain could be used in a story about construction deficiencies and defects. So as the Author, you're the only one who can really decide where the focus will be, what the root of the difficulties is in the story.
Imagine you have your story world with all these argumentative characters fussing about the defects. Suddenly, someone waves a magic wand and all the defects are gone. There is nothing wrong externally anymore. Do they still have a problem? i.e. are they still argumentative people that are having trouble agreeing and maybe are still manipulating each other, or stuck in fixed mindsets?
Your gut feel on that might help you figure out the domain. (You could also try the magic wand the other way -- it makes everyone into perfectly reasonable, agreeable people without any hang-ups; is there still a problem?)
Your idea of RomCom, and some of your summary stuff, makes me guess Manipulation, but it's a total guess. (Rationalization does sound pretty good too, and the Consider/Reconsider/Support/Oppose quad would definitely fit some of what you've got. But, first you should look at the Concern level and whether Becoming would fit as the Story Goal and everyone's Concern.)
P.S. Openness is under Situation/Future, not Mind; I think maybe you forgot to finish that section of your post :).
P.P.S. Whatever you decide, just "pencil it in" until you figure out your MC and IC domains, as those may influence your thinking or your whole story idea.