I wouldn't put too much faith into that website. It is the opinion of one person with no education or experience in canine nutrition. The ratings are based on bad assumptions. Jeff, if you are happy with the food and the dog is doing good on it that should be enough. I feed my working dog the performance(30-20), we train most days and she is in good shape. If I am not training I just reduce the amount of food.
I agree, however the abundance of corn alone is enough to question the quality of this particular food. Corn has no nutritional value to dogs and is simply a filler. Why feed your dog fillers that just get passed through and may cause gastrointestinal distress in the meantime??????? Doesn't make sense!