Ok the missing subpage showed up when i went to parent so it is showing all the pages...but there is still no way to distingush which subpages are which if they are named the same.
I have 2 subpages called "Data" they show up like this under both "Use settings from" and "Specific Post"...
The menu heirarchy is working it showing fine there, but im using specific post on each parent page to display menu of subpages.
Here is example of what im talking about showing subpages:
It still works the way you have it just have to select both the data pages in the Specific Post and go to the page and right down the page id's and guess which one is which till i find the right one. I assume the id's are in order from lower to higher so that might help a little...