Tweening Troubles

Ran into another problem, though it is fixable, it would take a long time to do it each time I wanted to.
The problem is that whenever I try tweening a hair piece to go from left to right instead of going sideways, it makes it into a circular movement. Like when a character turns his/her head and the hair is switching to the opposite direction. Well I am wondering if there is an easier way then making 10 different perspective hair pieces and then frame by frame working.