1835 miles of driving with the dialogue manager under constant use...
and special foam and at first things were better than before, but not quite good enough for all the various road conditions out there.
The problem?
The computer needs to be rigidly mounted. Bungee cords weren't enough, and because I was tinkering with things so much, I had removed the wooden panel framing the computer as seen in this pic:
I put that panel back in, and with the computer now firmly held in place, ALL my vibration problems were solved. I tested this on my drive back from Seattle to San Francisco and throughout the Seattle and SF Bay areas as well, and everything worked great! I wonder if this setup would hold up on Laguna Seca...