What do you all think of Iams large breed puppy / adult for a Yellow Lab?

Just curious because thats what I'm feeding my dog now (the puppy brand for now). I'm feeding him the recommended amount daily, but whenI put it down for him he acts like he hasnt eaten for days. I feed him 3 cups in the morning and 2 at night. Should I try and feed him more? He's about 65 lbs.and pretty active....