Boys or girls only schools also have to have their enrollment figure doubled so they are classed properly. You are right about the free lunch adjustments. If a school has more than 50% of its student in the free lunch program, it can petition to be dropped a class on athletics. There haven't been a whole lot of cases where the dropping a class has resulted in an unfair advantage for the larger school, so there is obviously some merit behind the process whether they want to come right and say it or not. There will always be an exception though.