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I have had the same problem since i put them. The only time they stayed put was when i had some work done at the dealer, I had one of the techs (a buddy) straighten them out again and he hit the bolts with the air ratchet pretty snug. This worked fine until i took the tips off to paint the valance and now they fall every now and again. I thought about having them welded but dont want to give up the ability to remove the tips for polishing.
I had/have a harder time getting them actually aligned perfectly than getting them to stay put.
Once you get them aligned (mine's as close as I can get them without wanting to commit a felony), heat cycle them. Once they cool off, you'll be able to torque them some more. If your car is not a DD, do this a couple of times without driving the car since driving the car will move them a little.