Remove bowl from water. Add in the sorghum, oil, eggs, and salt. Combine well. Stir in the 2 cups of whole wheat flour, then place bowl on stand mixer with dough hook. Sprinkle on 1/3 cup of the bread flour and start the mixer. Add remaining flour a little at a time as it kneads, until dough is smooth and elastic and pulls clean away from sides of bowl. Continue to knead about 3 minutes past this point. The amount of flour required will vary depending on the consistency of your sourdough starter and the humidity in the air.