It sounds like the Kibbe quiz gave you some clarity--a good thing! And confirmation of your tendencies and thoughts is always rewarding. I don't necessarily see the need to replace grown-up with dramatic in your moniker. To me, grown-up has an element of sophistication that falls short of "dramatic." A dramatic tomgirl, to me, would be a more exaggerated boyish look.
I tried going through the process on Kibbe's Facebook page, where he put all the quizzes and steps--a very elaborate, time-consuming process, which I admit I didn't complete thoroughly. I didn't watch all the films that were assigned, for example. I came up with Dramatic Classic for myself. I didn't see a minimum height for that category, though I did for Dramatic (and I didn't meet it, whatever it was). I recall Jacqueline Kennedy Onassis as one of the DCs that Kibbe identified, and I felt that my build kind of aligned with hers.
I do find I feel most comfortable in silhouettes that follow the DC pattern; I am finding it helpful to think in terms of straight up-and-down styles and lines. And a fluid fit, for the most part; a little oversize is good, but too much is overwhelming. If I veer too far into styles with a flounce or flap factor, I feel a bit like a fish out of water. In this regard, the Kibbe system has helped me cull out and avoid styles that I'm less happy wearing.
But this doesn't mean that I dress super classic, or dramatic. Those words mean something in the Kibbe world that they don't in the general fashion and style world. Or that's my take, anyway. Stripes are not a favorite pattern for me, and high contrast feels similarly very off, with my coloring. And my personality wants some edge, androgyny, moodiness, and creativity in my style.