There is no such thing as next page, because you are pulling information for a page and it does not know what the future is.
- Use "Previous Page Path" then either use "page" or "next page path" these are exactly the same as you have found out.
- Then it is a matter of getting your head around the idea that "Previous Page Path" is your 1st page and use the next Page dimension to work out what page was then visited.
Hope that helps.
I am doing exactly the same thing as you at the moment, would be great to see what dash you come up with.