for nutrition, it sounds like you're doing a fantastic job. I'd say something I looked into is buddy custard for my dog which you could add to this regimen. in terms of health benefit, if you research the budwig diet, you may find this to be something to consider for the long term.
I take caution as well! I think that pup just got a little lucky or had a natural response that was very different to other dogs. I'm extra careful with that stuff. *Plus it doesn't last long at my house.