Meryl, I think you can stick with your Gold Medal. I'm sure someone will correct me if I'm wrong,
but the protein content of flour can vary. KA is known for it's high protein content. Cake flour has a very low protein content. If I remember correctly, Pillsbury and Gold Medal are in between
So the lower the protein content of your flour, the better for most cakes. I don't bake cakes, but I use KA for my all-purpose flour and keep White Lily on hand for pancakes, biscuits, cornbread, etc because it is supposed to have a lower protein content than the above mentioned.
I researched all this several years ago, I hope the info hasn't changed.