I began feeding a raw diet to my Boxer about 3 months ago. I make a grind of chicken quarters, beef and organ meat. Is there any reason not to mix the variety of meats together?

I began feeding my skinny boxer a raw diet about 3 months ago. Within 3 weeks, he was looking better. Now, he's at a perfect weight. He does get raw chicken parts with bones, but I also grind some of his food. Instead of trying to remember to feed liver and muscle meat a certain number of times weekly, I grind everything together. I might have 1 pound of liver and heart mixed with 10-15 pounds of chicken quarters, plus 10-15 pounds of beef. Those amounts are approximate, as I'm not a stickler about that. Sometimes I even grind in a piece of fruit and/or raw veggies with the meat. He's eating it fine. If he seems to be getting bored with it, I sprinkle on a little garlic powder or a tiny bit of balsamic vinegar. It seems to attract him, so I'm thinking it may be the smell more than the taste.

My question is, is there any reason not to mix the variety of meats together?