I am new to baking bread, and I have a recipe that calls for 2 1/4 cups total liquid to 2 3/4 cup whole wheat flour and 2 3/4 cup unbleached flour. I have made this several times, and can never mix in all of the flour, which will cause the bread to fall when baking. I do not have a mixer or bread machine, and this recipe is not for a bread machine. Help! Thank you! 
Having 2 stones/steels in the oven is totally workable, the top one would cook a bit faster than the bottom one but that's not a dealbreaker. 2 steels will take longer to get up to temperature than one, whether an hour is enough in your oven is not something I could say. I would suggest you get an infrared thermometer so you can take measurements and know for sure, they are cheap and take the guesswork out of it.   