Cook corn syrup, brown sugar, eggs, butter, vanilla, and salt over medium heat, stirring often, until thickened and glossy, 10 to 13 minutes. Stir in pecans and cool completely.
Mix graham crumbs, sugar, melted butter, and salt until it holds when pressed. Press firmly into a 9x13 pan. Refrigerate 15 minutes.
Beat cream cheese, powdered sugar, and vanilla until fully smooth. Fold in 1 cup whipped topping. Spread evenly over the chilled crust. Refrigerate 20 minutes.
Spoon the fully cooled pecan topping over the cream cheese layer, spreading gently from the center outward.
Garnish with remaining whipped topping if desired. Cover and refrigerate at least 4 hours or overnight. Slice with a warm clean knife, wiping between cuts.