Namaste, Jay!
I'm afraid that his height depends upon his genes. By underfeeding him, you can stunt his growth, but I know of no way to make him grow taller than his genes allow. (How would you make yourself grow taller? I wouldn't mind being a couple of inches taller!)
Actually, if he is still growing taller, but more slowly, this is a good sign. Large dogs are often overfed into fast growth -- then their bones don't mature correctly.
Your vet is absolutely correct about keeping him on the light side. Too much weight can cripple him.
You sound as if you have a good vet. I would listen to him.
Good luck with your Saint.
kjd
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