Okay kids - what was I thinking? Of course, the one thing that was being tightened was not a clamp on the seatpost, but a clamp that holds the saddle in place on the rails (forward, backward, angle). For a supposedly intelligent person, I sometimes manage to confuse things pretty well!
My DH tightened it again before riding today, and it seems to be holding itself level and in place after 32 miles.... hopefully it will stay there. I did not have a problem with the saddle moving forward or backward, just tilting.
Still- maybe someone can confirm that this really is okay to have the seatpost reversed 180 degrees like this. (It was when I rode over a substantial bump and came down a little harder than usual on the back of the saddle, that the whole problem came up.




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