Duke uses the CSS profile to determine what a family can pay, not FAFSA.
It seems like you have the final answer from them and any additional appeal will be wasting everyone’s time. I don’t think you mentioned that affordability was an issue on your previous thread.
Regardless, if Duke isn’t going to be affordable for your family for the next 4 years, you might consider alternatives now, rather than later, as transfers tend to get less financial aid then first years (if it did happen that you had to transfer.)