[tcrist]

You say that you have had it aligned twice. How are they doing the alignment?

Is it a four wheel alignment? Are the rear wheels aligned with the frame then the front aligned with the rear.

Have someone follow you as you are driving down the road and see if your car "dog walks". If your rearend is ascued to the passenger side from the front end then it might do what you are describing. It might actually be the rearend that is trying to push right rather than the front pushing left.

Just a thought.