Mike I have been Feeding Raw since 1979, I am well aware of its' benefits! lol.
I too find it better for the dogs and cheaper to feed. However the fact remains that Raw and kibble do not mix well, and dogs are prone to upset tummies if mixed as a diet.

If you choose to feed a good quality kibble then by all means do so, but if you decide to go with Raw, then finish the kibble off , fast the dogs , and introduce the new diet slowly and with the easier to digest foods first.