Double check your installation, might be something under them.
I also run mine without stops, just the bars. Fair amount of time on the Blaster and lots on the Banshee, no problems.
Just another "opinion" type thing.
I somehow misplaced one of the bars for the Blaster so I dug out the old stops, should have used one stop and one bar, would have been an ideal test of "opinions".
Be sure to use a bit of blue loctite on the screws.