I think you're doing fine! Just remember to go slow. If you have a bump in the road, go back to where you were doing good before and start again. It's fine to be quite bone heavy in the beginning. Some raw feeders will start out on chicken frames/backs/necks only for a couple weeks to be sure that stools are firm before adding in more meat. So you can definitely add in quite a bit of bone in the beginning. Then gradually back off.
For fussy eaters ..... if you sniff a fresh chicken breast you'll see that is is almost odorless. For dogs used to eating kibble (which is very strong smelling), that's quite a change! So you can stink it up a little by adding some parmesan cheese. Or searing for just a few seconds in a really hot pan, or drizzling with just a bit of butter or coconut oil. Ribboning the meat with scissors so the dog has something to grab onto can help reluctant eaters. Rub on a bit of canned food if nothing else works. Anything to get them licking the meat and eventually tasting it.
Is the BARF you have available there the Billinghurst brand? I've heard good things about it. And it would certainly be easy and simplify things for you.
Then you can add in fresh meats and bones on the side.