One thing about Dunning-Kruger that I've never heard mentioned is self-esteem affecting one's answer. As in, if you explicitly mark a low score for yourself you're both divulging to others and admitting to yourself that you think you're a failure in that category. So imagine you're presented with one of these forms... what incentive/preventative is given to not let your ego's self-preservation instincts kick in and put you down as "average" (50%+) for anything and everything?
Basically, I can't imagine how you'd account for the societal matter of bravado and I posit that it has an influence on the outcome of DK experiments. e.g. if you tried to account subvert bravado and had some kind of reward at the end to say "Hey, if you successfully guess your percentile for a given skill we'll give you a cookie." (which of course would incentivize you to put "0%" and intentionally bomb the test.)
Basically, I can't imagine how you'd account for the societal matter of bravado and I posit that it has an influence on the outcome of DK experiments. e.g. if you tried to account subvert bravado and had some kind of reward at the end to say "Hey, if you successfully guess your percentile for a given skill we'll give you a cookie." (which of course would incentivize you to put "0%" and intentionally bomb the test.)