I use this calculator to make sure the feeding amount is appropriate for the weight.
http://www.raw4dogs.com/calculate.htm
80:10:10 should be perfect. If the meal you are serving only has meat and no veg, while I think that's ok, I have learned from experience that some veg actually is essential to the diet. For instance, I was relieved to know that kelp and spinach were in the dinners I was giving Kasey as he was going through chemo and the iron in the kelp and spinach would help his platelets. So that's one reason why I like adding a bit of veg. I also add in some carbs now and again, I serve the meal on a bed of rice or pasta. I have also put on a big dollop of yogurt on top, although I don't do it regularly. I also feed supplements/vitamins, but do you have to do this? Perhaps not. I think a diet like this really is complete, but it gives me better piece of mind to add some omega, or joint supplements.
You can feed bone as a treat to knaw and chew on without a problem. You will find that the meat mix will probably go down too easily, so chewing on a bone or a treat will help clean the teeth!
Switch to raw cold turkey, just like that. No weaning necessary.