Naked Berry Chiffon Cake

Name: Naked Berry Chiffon Cake
Ingredients: Unsalted butter, room temperature; 2 ¾ cups cake flour (not self-rising); 1 ¾ cups plus 2 tablespoons granulated sugar, divided; 2 ¾ teaspoons baking powder; 1 teaspoon kosher salt; ½ cup plus 2 tablespoons safflower oil; 9 large egg yolks, plus 11 large egg whites, room temperature; 1 cup whole milk; 1 tablespoon grated lemon zest; 1 vanilla bean, split and seeds scraped; ½ teaspoon cream of tartar; 4 cups heavy cream; ¼ cup plus 2 tablespoons confectioners’ sugar; 2 pints fresh raspberries; 2 pints fresh blueberries; 2 pints fresh blackberries; 1 pint fresh strawberries, halved or quartered; Edible flowers, such as pansies; Confectioners’ sugar, for dusting