Question: how moist should stuffing be?
Answer: The bread in the stuffing absorbs moisture, but if it's dry (as it should be, see above), it takes some time for the liquid to settle in. I suggest adding a little at a time, say 1 cup of broth for every 4 cups of dry mix. Give it a good stir, then let it sit for a minute. The stuffing should be moist, but not wet.