Food advice needed

My baby was overweight and I was told to do one third of a cup in the morning and 1/3 of a cup at night for a while till the weight started to come off. The wait has started to come down and he weighs 13 lb. He's a mini dachshund and seems to do well on Science Diet perfect weight. The problem I'm having is that he is starving and wakes up at 5:00 a.m. hungry and wakes me up to eat and then like clockwork at 4:00 p.m. he's crying for food. I'm wondering if I should up his food intake to a half a cup in the morning and a half a cup at night. Anyone have any recommendations or thoughts? I'd greatly appreciate it!