I think this may be related to this thread when we talked about Ifir backstabbing so low. With Ifir it wasn't so critical, but we're talking a donator weapon here this time ... Might want to look a bit deeper into the issue maybe.
Btw, my new all time low backstab with Ifir (base damage 54) is now 171 damage with daggerfall on



 Thank you very much Tyler! The warriors in my guild won't be happy but I sure am
  Thank you very much Tyler! The warriors in my guild won't be happy but I sure am