Like the decklid latch, the door striker should only be used to set the closing depth of the door. Do not attempt to use this to adjust the door height. Of course, all the while you're working with each door, you need to pay attention to the door-to-quarter and door-to-rocker gaps. Just realize that you may not be able to get them perfect without additional bodywork. That's why we're mocking up the car in the first place.