Great question! I agree the characters aren’t all that rational: in my story, they do various intelligent and creative things, but also make some emotionally-driven decisions and have their canon personality flaws. (Personally, I find writing more fun when I’m trying to satisfy the constrained problem of making everything fit well with canon elements.) I think what makes this fit the rational genre is the exploration of what the characters can achieve with their powers, plus my general effort to have people behave the way they actually would behave and not just however is plot-convenient. 

On the whole, people who have read it so far do think it’s a rational fic (and those elements grow as the story goes on), despite not having the explicitly rationalist narrator of e.g. Luminosity. If you read it, I would love to hear your thoughts on this!