Steering issue

I have a 2004 Ram 2500 Diesel with 171000 miles on it. Recently I have been having a bad floating sensation in the steering when I drive the truck. I had the ball joints and some other steering components replaced by a Cummins authorized service center. This issue got better but it is still present. I also replaced the sway bar links last summer myself. See picture below. Could I have screwed up something on the sway bar when I replaced the links and could that be causing the severe floating sensation.