Your situation/story sounds remarkably similar to my own. It's almost a bit eerie. lol Anyway, some of the stuff about morality could be indicative of Fe, especially the part about protecting others. The motive is subjective, but the focus is still external. Se could account for the showmanship, joke cracking, and especially the thrill seeking and adrenaline part. Wanting all the facts before a decision might, just maybe, lean more towards indicating, that you lead with a perceiving function. That's probably easier to tell based by how easily you're willing to change your point of view. Those who lead with a judging function, usually persist with their judgments even in spite of the intake of new evidence. A lot of the intellectual stuff probably just comes from being intelligent, but might have something to do with Ti. Ti wants to understand the nature of...everything. Most people don't understand Se well (myself included), as they see it only in its hedonistic outlandishness or paired with Fi, in ESFPs. However, the vast majority of the STP's here and on other typing forums are at the very least a tad bit intellectual, some are very intellectual. As for myself, my problems with "run away" bouts of Se, leading to periods of my life where I'm incredibly hedonistic, have lead me to lean towards xSTP myself. I disclose that, because, like yourself, I'm an atheist, an existential nihilist, I've questioned the meaning and purpose of life, read Nietzche, took a great intellectual curiosity in science, philosophy, theology, and ethics. I even usually test out as an N, and other people have even tested me as an N, but I think it's the Ti or my people reading skills.