Personally, if you have had a front-end alignment, I would go back to them with the complaint.

Keep in mind, a front end alignment will adjust the steering geometry to factory specs.

You still have two variables that are not fully addressed.

1 -- tire balance. normally, this should not affect the steering geometry; however, and unbalanced tire could give the sensation of a pull to one side.

2 -- road characteristics. This is the more probable cause of a sensation of pulling, especially to the right. Keep in mind that many roads are constructed with a crown that is necessary to channel water runoff to the sides. it is not uncommon to find a section of road has a high crown (higher in the center than on the sides) which will force the vehicle steering to the right.

So, under factory specs for steering geometry with properly balanced tires, you should be able to maintain a straight line steer on most roads. A slight pull to the right could be experienced if the road does have a high center crown.