I was feeding my boy EVO Chicken and Turkey and raw (kibble at night, raw in the morning).
Thinking out loud here - if you feed the raw portion at night, instead of morning, he'll have plenty of time to digest it and the morning poop would be firm and odorless. That's probably a good thing to test. The other possibility is to mix in things (kibble + raw) and feed the mixture both mornings and nights. Something to think about...
Like most people, I went through loose smelly poops and exercise-induced super-soft poops.
Called my breeder and almost had a screaming argument with her about this. I felt like I wasn't a good dog owner, not caring enough and just downright cruel because my puppy looked so thin to me. The sense of guilt was what drove all of that as well as the cultural expectation that babies are
supposed to be chubby.
The breeder told me to cut the amount of kibble well below what's recommended on the package - by a cup!!! (the bag called for 3 cups a day if I remember right).
Then, she told me to mix in raw ground beef splashed with boiling water. And later on, I started adding a little coconut oil to the food and occasionally a scrambled egg.
The second thing the breeder told me to do was to feed based on the waistline. Basically, she wanted to see a puppy that looks like a miniature adult, just ever so slightly fatter - not anywhere near a chubby puppy. Her instructions were to watch the waistline from above and to adjust the amount of food until it was just right (there are many guides on the internet on the waistline).
She raised many many generations of Vizslas and her own experience is that skinnier puppies live longer and healthier lives and the risk of hip dysplasia, allergies and cancers is greatly reduced.
Before this change, I was constantly inventing tricks to entice my dog to eat. We tried everything, from hand-feeding to getting on all fours by the food bowl. If I thought dancing naked on the table would make her eat, I'd do it.
But the breeder kept saying she wasn't eating because she wasn't hungry. So I forced myself to give her method a try. And it really worked for me. My dog became really interested in food, her stools firmed up and got smaller in volume, loose stools stopped and she started to look more graceful and after the addition of coconut oil her hair became shiny and glossy. We're constantly complemented on how good, healthy and happy she looks.
Looking back, I think I was reacting to the eating issue very emotionally. It's the same mechanic when we're crate-training - the screaming turns your insides out and makes you feel like you're hurting the dog. But in the end, it's a human issue not the dog's.
My 2 cents.