Whole Wheat Sourdough Tortillas

I have made these many times and I have found that though I use whole wheat flour to feed my starter, the tortillas themselves are softer/more pliable when made with at least 1 3/4 cups AP flour. The whole wheat version has great flavor but can become a little stiff after they cool. I do heat my milk and fats in the microwave until fats have nearly melted, give them a stir and add to the other ingredients. Note: When I am using a very sleepy starter or if I use discard, I sometimes add 1 teaspoon baking soda.