Frosting -

2 8-oz packages of cream cheese, room temperature (I used low-fat)
1 cup (2 sticks) unsalted butter, room temperature
4 cups powdered sugar
1/2 cup seedless strawberry jam
3/4 cup chilled heavy whipping cream

Cake -

3 cups cake flour
3/4 tsp salt
1/2 tsp baking powder
1/2 tsp baking soda
3 cups sugar
1 cup (2 sticks) unsalted butter, room temperature
7 large eggs
2 TBSP vanilla extract
1 cup sour cream (I used low fat)
6 TBSP plus 1/3 cup seedless strawberry jam
2 1/4 lbs strawberries, hulled, sliced (about 6 cups), divided