I feel your pain
Isnt it so hard to find the right level and food.
My understanding of these high % foods is based on my experience with working collies now my floss is from working stock and trained but she isnt worked anymore other than the odd farm visit and mainly to keep her mind active we do agility etc.
It is my understanding that the protein content in the food restricts how much you can feed [ backed up by the feed less on for example some 75/25 or 80/20] as overfeeding a high protein % food can result in the dog being unable to produce adequate stomach acids and enzymes to break the protein down, so this can result is food passing through the system undigested (usually loose poop). This can be overcome by reducing the feeding amount although should the dog be struggling to gain weight this can be an issue, a change in food to a lower meat/protein may be required so you can actually feed more.
I dont think that a high meat content in a kibble slows it down like raw, so it sits there longer so a dog feels fuller even with a small portion. so I guess with smaller portions a dog could feel hungry etc.
I also dont fully agree with this "all dogs are wolves lingo" as dogs have evolved etc but this is ony my thought so dont shoot me David
I feel from my experience of a 80/20 not the brand david retails i add quickly! the one the post person mentions
For my dog it needs instant access to energy so fats and carbs give this for my breed of dog a BC I find a food with a good level of meats [no chicken as she is badly allergic to this source] a grain free source of carbs and a good level of fats works for us.
Now [ my name drop] I feed MWH I have found this to work for us we use a 60/40 mix I have also a 70/30 which I use as the odd meal or treats as I am eager to test the other recipes but its a busy time for floss so I am staying 60/40 for fuel and stamina.
My vet suggested from his experience of allergy tests through his practices that it is more than 1% dogs intolerant/allergies to chicken and so I wonder if more studies have been done lately David ?
Heres me rambling I am sorry, Good luck with your search my heart does go out to you its so hard to find something that suits and ticks all the boxes you need.
Its amazing we have this tool developed to use via this site and the experience and support of the website owner to guide us.