Heather, the main positive I have seen in all this relocation discussion is this... it is for YOU and the girls. Apart from the thoughts on D12 visitation you have not bought up Smokey in all of this. This is YOUR new start and YOU WILL make it work.
I'm not saying it is all going to be easy/straight forward but it WILL work, because you are going to make it work.
If it doesn't give you everything you want in the long term, you will have some more experience under you belt and will find something else, somewhere else.
I think that some distance between you and your family may be a good thing. And starting over somewhere new, you can be who you want with whom you want. No history to be judged by.
Some difficult days ahead but I have no doubt you will be happier when you get there. Good luck Heather. Abxx