A little late to this post...
We might have twinsie Akitas behavior-wise. Mine will be 1 yr in just a few days, and she is now at 3 cup+ daily. We feed 2 cups kibble (1 at breakfast, 1 at dinner), and give the additional cup via treats, positive reinforcement and "snacks" (like frozen kongs w a combination of kibble, Real Meat jerky, peanut butter, canned pumpkin).
At ~85 lbs, the vet says she looks great and will be a big dog. Also acts like she has never seen food before at each meal.