My puppy was growing so fast at 6 months that I was feeding her close to double the recommended amount and she could have and would have eaten more! Don't worry so much about the chart, just keep the puppy in good shape. If you can see or feel her ribs easily with the backs of your hands, and she has a distinct taper just before the hind quarters, then you're definitely not over feeding!
It's not the size of the dog in the fight, it's the size of the fight in the dog. Mark Twain