Have you called
CW? You may be able to refi into a 30 year, even w/the negative equity. They offered that to us.
I don't think NACA can help w/a second unless it is w/the same servicer as the first (even then, I'm not sure I've read any approved mods for the 2nd, but I've heard of them submitted). They were not able to help us w/the 2nd at all, and suggested we try to refi the second on our own. I was offered an (unaffordable, but good rate/terms) mod through my 2nd lender. It's worth a call.