I would switch, both Fromm and Orijen are great foods i used Fromm puppy and was very pleased if a pup gets to much food they usually have soft ice cream texture or watery poops could also be some sign of allergy.
hoping you find what best works for Chunky White may cost a bit more but far less visits to the vet, better health and no worries.
They also like fruit and veggies mine goes crazy for carrots, celery and likes apples, blueberries,strawberries and cranberries
Coconut oil and fish oil are great for the coat and the immune system
Have fun learning what is best for him and keep track of his allergies - Benadryl a new friend