I also keep my pups on LBP food until 18 mon. Another option is a food for all life stages. Just be sure to continue keeping calcium levels to 1.5% max.
After your dog has a meal try to make him chill out for about 1/2 hr. I have trained my dogs to chew on a marrow bones or Nylabone type chew toy. This allows the food time to digest (which prevents reflux), helps prevent torsion and cleans teeth.
If your Lab is anything like mine (and I guess all Labs) he probably inhales his food. Try a slow feeder. And add warmish water to kibble.
