Baking with whole wheat is one of my favorite as i love the nuttiness of the whole grain. Anytime a recipe calls for all purpose flour, i try it once as is, then i try it with 50% wheat flour substitution and sometimes i completely replace the refined flour with whole wheat. I have to say though that not all recipes work great with whole wheat. There are some recipes that just needs the all purpose flour. But as a trend, i have noticed that whole wheat pastry flour works very well when substituted for all purpose flour.