did you use the same quarter?
Not to belittle the potential for damage, but I would not be surprised to find a variance in the thickness of quarters. I suggest if you are going to use a quarter as your reference, then use the same one.
What you should do is as Dieter (DWZ8) says and measure the tops of the towers, and also have a 4 wheel alignment done on your car.
I will tell you that my car does have some doming, though it is not severe, and my alignment was way out. When they aligned the car they were able to get it well within the spec- and the key thing is to look at the after results for side to side- (eg- front right vs. front left) if the side to side numbers are really close you are looking pretty good.