Your question was the source of much angst on my part 5 years ago. Even with calling the offices asking the question directly, it was very difficult to get a straight answer. Actually, I never felt I did.
I have felt children of divorce get short-changed in the f/a process. Yes, there are 4 people producing income, but there are 2 households being supported.
On your list, we dealt with Boston College, Yale, Duke and Vandy. BC was the most difficult to work with; Duke gave the most aid, with Vandy a close second. YMMV