Stock tires hid the fact that your alignment was off enough to change the position of your steering wheel? Unless you notice major pull one way or the other with the new tires, I call bs. A tire might wear in enough to pull in one direction or the other, but the only thing that is going to change your steering wheel position, excluding suspension damage, are the tie rods/ball joints.
If you plan on keeping your Z for more than a year, find a shop that offers lifetime alignment and see what they say. I take our cars in about every quarter just to be safe; a properly-equipped shop can pick up on minute imperfections long before you will notice them yourself.
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