FAIL. After all my additional effort, I went out on a 35 mile ride. The rear came loose after 1 mile. But I was ready - I brought the Campy skewer with me just in case. I replaced Neuvation with Campy and had no problems for the remaining 34 miles. That included several rough road sections and even some paver bricks that shook everything. No problem.

I just don't think all skewers work for all dropouts. On my older Italian frame with Columbus chromed dropouts the Neuvations just don't bite enough. But I used Neuvations on a newer Seven Ti I had a few years ago and never had an issue. I'll just use Campy with my new Neuvation wheels (and I love the new wheels).