How were you measuring it out of the bag? If you were just jamming the measuring cup in there and shaking it level, that packs the flour down and you end up with way more per cup than the recipe wants. The spoon and level trick fixed this for me, you fluff it up first, spoon it into the cup, then level it off with a knife. Curious what method you settled on, because 4 batches is a lot of trial and error.