The Pig's Iri addon is bugged and even if you remove the headtrap it will stay permanently on and be impossible to remove, any attempts after "getting it off" will result in the animation at the boxes being instantly cancelled. The addon should probably be killswitched until this is resolved as it guarantees anyone…
I noticed when running Fixated that I was slightly faster on the ground but wasn't sure. I recently tested it with a friend and timed my speed and I was definitely going faster. While I doubt a 20% increase to movement on the ground would be a problem I still found it worth reporting in case it might become something worse…