so you would trust water at 60-80' on your property over water from 400'? i would also think that the shallower well would have more iron than one at 400, at least thats the way it works where i am in NE FL. a well deeper than about 250 in my area will have 0 iron.
i live on an old chicken farm started in the late 50's. For the first 21 years of my life, our house was fed by the oldest well on the farm that is about 30' from a chicken house. now i drink water from the 2nd oldest well on the farm thats across the street, right beside the hatchery (where the real chemicals are). lol, i think you will probably live.