high hydration dough

I'm in the process of making the Honey Whole Wheat pan bread from Advanced Bread and Pastry. It uses a firm levain and instant yeast. It is a 100% whole wheat, except for a little bread flour in the levain. It is also interesting in that Suas specifies a double hydration technique, mixing initially with about 80% of the water and adding the rest slowly after the gluten is somewhat developed.