Rough Riders take note:
Adjusting both frunk and rear hatch adjustments properly made a huge difference in taming my car. I only felt one small stretch of road in the 100 miles we drove tonight that felt odd. I can not say if any of our other cars would have fared any better without trying them there too. I do not have VibSensor plots as that wasn't my intent this trip. Personally, I'm happy enough, for now, that I'm declaring my issue resolved.
DO YOURSELF A FAVOR and follow the link I posted earlier, check and make any necessary adjustments before agonizing any further. You might be surprised. I know I was. Use a very light coating of Vaseline, flat with no peaks, as an indicator that surfaces have mated...
Think of it this way: If your hatch is not secured, every bump in the road is going to cause it to move, violently. Picture a 100 plus weight or person bouncing up and down in the back of you car. Get the picture?
-Joe