Brent, I only read the first page of this thread, so if someone else has a suggest along this line, then this is backup.
There was a number of ajustable nuts that come loose even after repeated setting. I have a set, thought I was loosing my mind ( most people know I have ) as the valve train would go out of whack after a short period of time.
Finally had to switch to another suppliers adjustable nuts to fix it.
What we did to find the problem was just about everything all the other suggestions cover. Then I measured the distance to the nut from the top of the stud. As it got shorter and shorter, we determined the nut was walking back the threads.
Also had a head that the press in studs walked out, acted the same way. I would think you have screw in studs and they are secure.
Well, I hope this helps. I am not sure I would want you buying my lottery tickets.
Good luck.
