When I saw your thread title, I immediately thought of giving you a yellow butter cake recipe!

I think that, unless you try making it with egg whites instead of whole eggs, a scratch cake will always seem denser than a cake mix cake.
I pulled out my
old Betty Crocker recipe book and looked up the yellow cake recipes. There is a "Bonnie Butter Cake", a "Starlight Cake", and a "Dinette Cake". I have made all of these cakes over the years and they are not light and fluffy.
I also have a "newer" copy of Betty Crocker cookbook from 1986. It offers the following yellow cake recipe:
Betty Crocker Yellow Cake
2 cups flour (if using self-rising, omit salt and baking powder)
1 1/2 cups sugar
1/2 cup shortening
1 cup milk
3 1/2 teaspoons baking powder
1 teaspoon salt
1 teaspoon vanilla
3 eggs
Heat oven to 350°. Grease and flour rectangular pan, 13x9x2
OR 2 round pans, 8" or 9". Beat all ingredients on low speed, scraping bowl constantly, for 30 seconds. Beat on high speed, scraping bowl frequently, for 3 minutes. Pour into pan(s).
Bake until wooden toothpick inserted in center comes out clean; rectanble 40 to 45 minutes, rounds 30 to 35 minutes, then cool. 15 servings; 220 calories per serving.
Then, I also pulled out my copy of The Pocket Cook Book from 1973. It lists a recipe for "Fluffy White Layers" that sounds interesting:
Fluffy White Layers
3/4 cup shortening
1 1/2 cup sugar
3 cups cake flour
4 teaspoons baking powder
1/2 teaspoon salt
1 cup milk
1 teaspoon almond extract
5 egg whites
Cream together shortening and sugar. Sift together flour, baking powder, and salt; add alternately with milk to creamed mixture. Add almond extract. Beat egg whites stiff; fold in. Pour into 2 greased 8" or 9" layer cake pans. Bake in 375° oven for 30 minutes. Cook 5 minutes. Remove layers from pan to cool on wire rack.