Like @mlucas said about Unique Ability und Flaw, I think the Dividend probably isn't the best point to start with, especially since you can find happiness with any given type.
I do think that Ryuji is a Be-er; he mostly internalizes things, and if you read the novels, you know that he tends to chastise himself for what/how he thinks. One could even say that in the last arc we see a tease of what might happen if Ryuji changed to Situation instead of the other way around...?
I definitely agree on Steadfast and Be-er, though I'm not quite sure about Outcome and Judgment. What exactly is the baggage that Ryuji brings into the story that he gets over at the end? Is "setting the other up with their crushes" really the goal of the story... or is it something else? The story keeps going even after Ryuji and Taiga get together. And it doesn't feel like it's just dragging its feet to fill the obligatory number of episodes.
In general, what is Toradora "about"? You said it "looks at how people judge people by superficialities without giving them a chance to know them." But while that's where most of the early frustrations come from, I don't know if I would call that the "thesis" of the story. As cliche as it might be, it's mostly about... love. Immature, simplistic views of love and how those views can lead to a lot of frustration and pain. Most of the cast are teenagers who have never been in actual romantic relationships. And even the adults show this immaturity: Ryuji's child-like, single mother, Taiga's parents (especially her father), the homeroom teacher...
So maybe the goal is to figure out what all this fluffy nonsense is all about.
I will have to think about this further, but right now I see the concerns in either the lower right corner or, less likely, the upper left, since I can't tell how memories would be a concern to Ryuji.