Boil the macaroni in water with 1 teaspoon salt for 3 minutes less than the package directs and drain.
Butter a 6-quart crockpot and add the pasta, evaporated milk, whole milk and remaining salt.
Cover and cook on low for 45 minutes, then stir in the cheddar and cream cheese until mostly melted.
Fold in the hot sauce and chicken and cook on low for 45 to 60 minutes more until the chicken reaches 165°F and the pasta is tender.
Switch off the heat and scatter the blue cheese evenly over the top just before serving.