Alignment can be a real can of worms. First, let me say that many of the newer vehicles have settings that are NOT adjustable. Manufacturer will say that if a particular non-adjustable setting is out of spec, it is because of bent or worn parts.
Now, to get to the REAL issue.....the following settings have the following effects....
Caster. This is one that can cause hard steering, slow return to center, or pulling to one side or the other. Will NOT cause tire wear. Caster should be within 1 degree of the same from side to side, with 1/2 or less preferred.
Camber. This setting is how straight up and down the tire is in relation to vertical. In at the top is positive camber, out at the top is negative camber. Camber is generally within a degree of ZERO. Variation from side to side is allowable up to 1 degree. Camber can cause pulling or drifting to one side or the other. Also, camber can cause uneven tire wear. Many times, camber is adjusted to counter the effects of road crown.
Toe-in or toe-out. A VERY important adjustment. Needs to be set as closely as possible to factory recommendations. Can cause rapid, excessive tire wear. Typical tire wear patters is "bars" across and diagonal to tread.
The problem you describe can be caused by a number of things. Without looking at the numbers, I could not venture a guess.......
Toe in is important because it shows initially as wear to the edges of the tire(s). If toe is not centered on the steering rack or gear, it can cause excessive wandering and imprecise steering.
Camber will generally pull to the positive side, though not usually a strong pull.
Another factor is if an alignment was done on just the front end or on ALL FOUR!!! On a rear wheel drive vehicle with non-adjustable rear, a thrust line alignment is recommended. This trues up the front end to the actual tracking of the vehicle. Id the rear is adjustable, then you should only do a 4-wheel alignment. Doing otherwise is just throwing money and time away.
One other thing that can be a factor is simply a bad tire. In this day of radial tires, the general thinking is to maintain the direction of rotation of the tires. This means that rotation amounts to moving the fronts to the rear, and the rears to the front. If a tire is causing a pull, this will not generally remedy the problem.
This is about all I can offer without seeing some numbers........
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