That looked a lot like my first few attempts at a backroll. Mine looked like an off axis 3 attempt.
If you are in fact trying a backroll, here is what I did differently. I'm still not landing them, but getting really close and spinning correctly now. Trying lifting your lead shoulder (left) upwards, while tilting your head towards your trailing shoulder (right).
Also, check out
http://www.youtube.com/watch?v=ponTdgycYV8