Our three year old Britt gets ~3cups total for a day, split into morning and evening feedings (he's generally on the larger side of the scale for a Britt). If we go much more, he packs on the pounds. Now that it is hunting season, we may go a bit more depending on activity level. It sounds like you are in the ballpark for total volume, the key is to watch his weight and adjust accordingly. Generally, more activity = more required energy/food.