whisper,
I'm a "better late than early" type, so I think you are doing fine. If your oldest is 9, I would certainly start adding a little more to her day. Make sure your read alouds are not twaddle. Have a mix of science, history, and fiction. I love Charlotte Mason! How old are your others? My oldest is 6, but I do not intend to start requiring work from her until she is closer to 8 or 9. Now she does do work, but I don't require it yet. Does that make sense? We are very relaxed. I have never had to "de-school" but I think it would benefit you to take the time you need. If you get scared and jump into boot-camp mode, you won't accomplish your goals for taking your kids out of school in the first place.
We are working on lots of behavioral issues as well. And making the switch to GBD is not easy. Give yourself a little more time. I'll bet by January, you will be in a better place.