If Douglas is doing well on it, I'd try NOT to change it.
Both my bullies only wanted to eat any kibble warmed up(stimulates appetite
and usually w/added broth, tsp cottage cheese, a sardine~water or olive oil packed,
tsp of canned organic chicken, thick slice avocado, soft boiled egg~any one of these
or whatever he loves, as a topper. Good luck & let us know!