Consider yourself lucky!!!
My wife has been in the Veterinary field for over 47+ yrs, so I've heard many horror stories about homemade dog and cat food. Furthermore, I've gone to week long 40 plus hrs of continued education seminars with her in Vegas. I've sat in on classes that DRS / Specialist, animal dieticians have taught. Feeding Dogs cooked prepared meals is most of the time not a good thing. A "raw balanced" diet is where it's at, if you want to be sure you're doing good for your dogs or cats. It's normally not hey, I'm gonna give them a little of this and a little of that, because it looks and sounds healthy.
Don't take this the wrong way, I'm not trying to talk you out of doing what's working for you, or saying that you're not doing the right thing for your dog. Because you're obviously seeing the results that you're looking for.
But it can never hurt to research an animal dietician approved recipe, to see how close you're to feeding your buddy a proven diet, and it's truly fascinating information.
It might be as simple as adding a few scoops of brewers yeast or parsley to what you're already feeding.
Good luck.
Dan.