Comfortable Riding Shock?

2string1

I bought the car last summer from a dealer in New Hampshire. I test drove it a couple of miles on a 2 lane road. It felt fine so I bought it. On the drive back to Vermont on the interstate is when I felt the hard hits on the bridge joints at high speeds.(could be normal for a Z) I only drove the car for a month last summer and only in my town. Now that I have driven it more this summer I am asking if I can soften the ride some how. According to some, it's me and not the car. Well, that's good to know I guess. I'm running 36 psi I'll take some air out and see if it helps. I love this car.