This is easy. Go with Nature’s Variety Instinct Salmon Meal Formula. Grain free, potato free, and rich in protein.
But, I thought you were going with a limited ingredient diet? Nature's Variety only has 2 L. I. D. formula that I know of... Turkey and Lamb. Both very good for allergic dogs.
Natural Balance has rice. That's grain. And Natural Balance is high in carbs, low in protein. So, Nature's Variety Instinct is generally a better quality formula for dogs.
Go for Nature's Variety and cycle through their Limited Ingredient formulae or their Instinct formulae and find the best one for your dog.