Rough riding W124 (New struts and shocks)

[skis3]

I installed new OE spectrum front struts and mounts, rear shocks, and front sway bar bushings, but the ride is still pretty rough. Additionally, I changed the inner and outer tie rod ends and had the car aligned. The rear end creaks pretty loudly when I turn into my uphill driveway. I am thinking of changing rear sway bar links. Any ideas how to diagnose suspension problems. The tire pressure is around 30psi in all four tires. Thanks, Bob.