Question about Orijen large breed puppy

I just bought the Orijen large breed puppy but I want to make sure I am not overfeeding him. I was going to go with the adult but this is all the stupid store had and it does not cost anymore then the adult. I think the only difference I see between this is lower fat. He is 13 weeks and he weighs 22 pounds. His expected adult weight will be 75 pounds. http://www.orijen.ca/products/dog-food/dry-dog-food/puppy-large/ I don't know if I should feed the amount on the bag or less. I am very worried about over feeding him and causing him to grow too fast.

Just watch him. Keep him lean. Adjust down if he starts to pudge up a bit, add more if he starts to get skinny. Every pup is going to be different in the amount that is right for them.

What a new puppiy? do you have pics?