[speeder]

Always swap the tires first if a car still wanders or pulls after an alignment. That's the two front tires, left/right. You need to eliminate that possibility before going further.

I'd say that even if that corrects it, rotate the tires front/rear, putting the swapped front tires on the rear on the side they were on before you swapped them. Radial tires should not generally have their direction changed halfway or part way through their life.