I imagine that how the students behaved and what "seems fair" is heavily biased by the cultural context.

I agree that 22% redistribution seems about fair, but I'm biased by a lifetime of rates of taxation.

Something I'm very curious about is what should we be trying to optimize for (economic growth, sense of well-being, energy output, raising the economic floor, etc.?) and then what gini coefficient optimally produces that outcome.

I understand it's outside the scope of this study, but my bias is my curiosity for what should we be aiming at and what principles will optimally produce the result, so then at least we know in theory what we should be trying to do.