I also had a slight discomfort in the highs and just inserted one layer of the dampening cloth you get with the headphones and had zero issues after that. I don’t feel like it reduces the detail as much as some say, but narrowed the layering slightly and had no effect on imaging.
Love it! I am using my DCA Closed X with the Topping G5 currently. Had to be a closed-back because my office is next to a busy street