I too feed raw, but I go by the prey model diet rather than "barf". Dogs are carnivores and cannot digest the cellulose in veggies and fruits. If you still would like to add them to the diet, I can't see them doing any harm but I would not include them in the daily percentages your dog needs to consume. You can make the nutrients in veggies more available to them by running it through the blender to break up the cell walls. But, you've probably read all that before in your research
Personally, I forgo the veggies also and just stick with meat, bone and offal.
I'm sure King is loving his diet and he is a very lucky pup to have you!
Delilah: 8 years, docked and floppy. Felix: 2 years, docked, floppy and deaf.