Fresh milled flour takes longer to absorb liquids than store bought flour. For this reason, it works best to mix the buttermilk and flour together first allowing the flour to absorb the liquid while the rest of the ingredients are added. If when everything is all mixed together and the batter seems to thin, giving the flour a little time to continue absorbing the liquids can make all the difference. If for some reason it does not then add a little more flour in until you get the desired consistency. On the flip side if the batter is too thick add water or buttermilk to thin the batter to the desired consistency.