Update to my Aug 3 comment: I've since remembered/noticed that my car was set to automatically raise the suspension to high at my home location, at the driveway entrance (I set this when I first got the car). Upon leaving home I recently noticed it still remained in the high raised suspension mode (even after 2 miles from my home) and I would experience the shuddering. I'm now wondering how long or far after leaving home does it still remain on high suspension before going back to the normal setting. I had assumed it would return to the normal setting immediately after leaving my driveway area, but no, that is not the case. I've since removed the "learned" auto high setting of the suspension for my driveway location, and I'm not experiencing the shudder that I previously described at 30-35 mph after leaving my home. This reaffirms what Tesla Service said to me, that using a lower suspension will lessen the possibility of the vibration. No more shuddering at this time, at least for now.