You make an excellent point. I think part of it was poor word choice. A more thematically accurate way of referring to the rolls would be "By the Book," "Loose Cannon," or "Balanced." The Luck/Loose Cannon rolls are supposed to be "try something crazy, maybe it fails, but luck will be on my side in the aftermath." It's trying to get at that trope of wild card characters (like many secret agent types) succeeding because of the impossible-to-predict outcomes of their chaotic actions.
But as written, yeah, Luck rolls are the least lucky in terms of action success chance. Definitely the first thing I'll edit after judging is over. Thanks!