We've discovered by only throwing corn in the morning with our auto feeders that its cut the coons out completely and allowed us to move our deer movement in the area to 8am-2pm hours with an occasional afternoon snacker.
Once you can adjust the amount of corn down to the amount needed to feed them enough that that get full and eat it all it leaves none for those nocturnal coons. As far as squirrels there arent as many as before when we just thru a bag of corn at a time but a few still come in.
We throw about 3-4 lbs at 7am each morning and its enough to feed our 5-6 doe and 2-3 bucks in the area for a good morning feed. They normally come back and munch on our food plot until the corn throws.