I wouldn't be too hasty to rule out ISTP.
I've known several very organized ISTPs (and ESTPs) who drive for closure. Organization is often as much an aesthetic thing as it is a functional thing. Sometimes SPs just like the look and feel of an organized something (others like the look-and-feel of clutter). The T would then keep the organization utilitarian.
Even INTPs want closure for their Ti's. How does you use something without really have things pinned down? In my designs (software or hardware), I keep things very structured. I also know where most of things I care about are, though my room is, objectively a mess.
Life themes and flavors of type will modify descriptions slightly.
For instance being involved in the "physical" life theme will make you seem more SP. This goes for all types and temperaments. Being more involved in the "entrepreneurial" life-theme will make you seem more NT, no matter what your actual temperament.
Lack of development of your auxiliary, can lead to relying on other extraverted functions too much(like Te), instead of channeling the needs exposed by those functions through the auxiliary. When I was younger, I believe I relied on a weak Fe too much (resulting in my current oversensitive neurosis).
But adding to a former thought of "?". Are you more of a planner, a conceptualizer or an analyzer?
I suppose the simplest most revealing question is: "What makes you unique?"