Dough – Making dough fluffier

I can't speak to your specific flour but I have worked with coarsely ground whole wheat flour.

My standard bread recipes required quite a bit more kneading than usual. Additionally I had to work with them while they were still quite sticky to eventually get them to an elastic consistency.

I use a stand mixer to do the kneading for me- I'm afraid that it would be quite a mess doing it by hand. Remember that, when forming gluten, you can always trade work for time. If you can't find finer flour then I would recommend kneading the dough as much as you are able, let it rest for 15 minutes so the proteins relax, and then knead it again and see if you can't get the consistency you want without kneading all day.

Make sure the flour isn't so coarse, or has shards or bran, that would actually cut the gluten and prevent it from forming sheets. If this is the case then I don't know if you could make bread out of it predominantly. Perhaps if it were soaked overnight as in a poolish?

I mill my own flour to the finest possible setting and this seems to produce a much better textured bread.

As for the lack of rising and yeast- it is the same problem. Yeast are perfectly happy eating damaged starch in your flour. Adding sugar wouldn't necessarily help. If your dough was not elastic and failed your window pane test then there is nothing to really hold the structure of the bread. Your yeast may have been going crazy and there was just no balloon for them to blow up.

I agree that cornbread will not have the structure you need since it's close to a sponge cake. Instead of modifying a cornbread recipe, I would recommend modifying a pie crust recipe.

A standard pie crust is approximately 3 parts flour : 2 parts fat : 1 part water. To achieve the cornbread flavors, replace some of the flour with the cornmeal, as it can serve the same purpose as flour in this case. You can also replace some or all of the water with milk or buttermilk. If you do not like the grainy texture of the cornmeal, soak the cornmeal in the liquid you choose for several hours to overnight.