I think you’re way overthinking. Your record is your record. UNC is a reach let’s say - so make sure you have others on the list too. There’s no silver bullet.
In the last common data set they published, 74% of students were in the top 10% of the class and 94% in the top quarter. Now, of that 20%, we don’t know - were they 11%, 14%, 24%.
So 6% are below the top quarter and that likely includes athletes.