I had a Waag bar and it did the same thing. The full size bars will always jiggle- I haven't seen one that doesn't a little. The obvious key is that they don't move enough to touch your truck and mark it. Double check that all your bolts are tight and secure. Also, most bars have a little play when it comes to aligning them. Make sure that the bar is pulled out as far from the truck as possible before you retighten any bolts.