I would check your front track bar. How did you install the new one? Did you have someone rotate the steering wheel or force it in? It seems the track bars play a big role in death wobble if not installed properly.
Hello, i'm new here. I drove mine 400 miles from out of state on cruise control 60-70 mph. Even went up the imperial valley grade on cruise control. That is my only regret about the breaking in period. It's been running great so far.