Sounds like you're familiar with all of them, but you didn't mention Biblioplan.
http://www.biblioplan.net/
And I definitely get the ages struggle! While I have an 8 and 11yo, their abilities, interests, and understanding varies greatly.
We're going to give MOH a whirl this year after using Biblioplan for Ancients. After previewing BP for the Middle Ages, it did not connect the dots for me in terms of a Christian worldview. However, we have enjoyed it for BP Ancients. The books for each grade level were very helpful and much to my surprise, our library carried a lot of them.
Hope you find something that will fit you and yours,