Using bread flour in your mix will result in breads with the highest volume. Bread flours are blends of special wheat that are higher in gluten forming protein than regular flour. That extra gluten gives more structure and higher volume to the bread.
Blend the flour mixture really well, this will ensure that each loaf bakes up just as nice and flavorable as the next. If you don't have a bowl large enough for mixing use an extra large food storage bag.