So as I am sure you know fsQCA refers to fuzzy Qualitative Comparative Analysis where instead of using a either/or 0.5 delimitation of either belonging or not belonging to a group in a truth table there is a more sliding scale that gives you also the relative strengths of belonging or not belonging as a way to help deal with complexity. One can set this within the conceptual framing of Emergent theory which is a method used to make sense for example of the movement of flocks of swallows or the group dynamics of people when having to quickly leave a building. Though I am sure you have already explored these avenues I can provide you with some readings if you have not.