I had similar issues with the mighty mounts, and I opt'd to get the x-bar system (I think that's what it's called), so that I have the 4 (sturdy) mount points and 2 bars and just ditch the mighty mounts. When I'm hauling a bunch of kayaks, I want to make sure everything's sturdy 'cause you're looking at like 300-400lbs if you have 3-4 boats up there. I haven't had a problem with my setup... but maybe I didn't put the mighty mounts on correctly either?