It is common for a car to pull in the direction the road surface slopes to drain water. Since that is to the right on two lane roads, it is possible that what you are feeling is normal. I would suggest that you find a 4 lane divided highway where the fast lane is sloped to drain into the median, and see if it still pulls to the right when the drainage slope is to the left.

Tires are often the cause of pulling. I have found that switching sides with the two front tires can change the direction of pull. With the directional tires you don't have the ability to do this switch, nor can you cross rotate the tires, which is a good reason to stay away from directional tires.

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'97 E 300 D