It might be a little bit extreme, once you consider all three changes that were made. Not sure yet, ofcourse.
I've got a solution, though, to the svartalfr-the typical one for the badger-how about creating a few more svartalfr units? Certainly they should be working for Vanir, but why not some more support units? maybe a unit that throws armor-piercing francescas (axes ala the Francs) and maybe a low-level researcher-like 1 death, 1 earth, that aren't capital only.
Maybe another combat type that can transform into a giant badger
I've got some more ideas along these lines that I'll post later. Right now, I've got an appointment to catch.
Before I go, though, Vanir were famous for being shape-shifters, so they should have access to *something* along these lines.