Add the all-purpose flour, bread flour, sugar, salt, and remaining flour to the bowl of a stand mixer with the paddle. Mix the ingredients on low speed until well combined. Add the eggs, orange zest and the saved yeast mixture and mix until smooth.
Roll the dough using your hands. Gently press down on the two sides of each ball and create oval tapered shapes. Place the buns on the baking sheets and cover them with a towel or plastic wrap. Let rise in warm until they are puffy. Around 40 minutes.