In my experience with DS when I switched from breast to bottle (not as a moderater) Ds was a small eater for the longest time, and still wanted an early am bottle too. What I did was try to get him to drink more formula at each feeding, then I would give him his cereal an hour or so before bed, then his bottle at bedtime and one night decided to wait until 7am to feed him again.
It was rocky the 1st couple of nights, but after a couple of days, he switched and ate more during the day. Now he REFUSES anything in a bottle at night (if I think he needs water etc) and has breakfast about 1/2 hour after waking.
HTH
and good luck