I didn't read your other thread but wanted to say that Innova caused my pup, who is the same age as yours to have the same type of poop issues you are describing.
A little back ground; He was tested for Pancreatic Insuffciency, (please excuse my spelling
) of which his was a 6, bottom end is 5! He was also itchy, lost most of his coat and was definitely not thriving. He was sooo thin and his poop was never solid since day one with him. We got him at seven weeks.
I tried so many foods, and different things. He is now thriving, great poops, his coat is soft and stunning (he is a long coat). The turn around happened about 2 months ago. The vet put him on Metro for Girardia, just in case, no differemce. He was repeatedly wormed. Developed Yeast infection of the skin. Egads what a nightmare.
This is what finally worked for him. Left the Vet out of the equation, good food recommended was Eukanuba and more drugs.
He eats a mixture of either Taste of the Wild Pacific Blend and Wellness Venison and Rice. 3/4 Wellness and 1/4 TOTW. and as of late Orijen LB Puppy mixed with 1/4 Wellness. Both combo's work great. To these I add Natural Organic Yogurt or Probiotics. I Tbls. of Dr. Foster and Smith Premium Coat Conditioner 1x per day. He is fed twice per day. That is the PM feeding and in the Am I add some Evangers canned premium chicken to the dry and not the above. Also give him Spring Water as I did some reading on the minerals lacking in water supplies. He is now the picture of health! The only thing that remains is he is occasionally itchy, not bad no hair loss. This I attribute to laundry soap. I forget sometimes to wash his blankets in one of the allergy free nothing added detergents and fabric softner.
Hope some of this helps. Will go and look at your other post later also. Wishing the best in your trial and error it can be a pita. I have to order the Orijen also, no one carries it here.