Making the switch to all raw patties since puppy has loose stools from kibble a good idea?

I Have been feeding my Shiba Inu 1 1/2 year old raw chicken and lamb patties that I buy from an upscale pet store in California here. He gets 3 patties in the morning and then some snacks in the day and then he gets lotus brand kibble which is a all chicken product that has many veggies and vitamins like an upscale organic kibble. I put ground up chicken on top to make the kibble more interesting. My question is should I switch to all raw patties by lotus since he seems to get loose stools from something in the kibble? He has been having slightly loose stools for months on the kibble and he has already been stool tested at the vet for parasites, worms. etc. Have you had good luck with all raw and firmer stools? I just don't like the expense of going all raw though.