What have you done to kill the 1st reflections bouncing off the wall on the sides of the speakers? Have you played with toe in, starting with the axis straight ahead and also for comparison with the axis crossed well in front of you. If you don't detect a difference in the highs and focus as you do this at least you've eliminated one possibility.
Have you placed you listening chair strategically (acoustically) so your 1)not in a null or a node or 2)not sitting in the path of a reflection off a wall, window, etc. Have you done anything about the wall behind you?
Have you placed you listening chair strategically (acoustically) so your 1)not in a null or a node or 2)not sitting in the path of a reflection off a wall, window, etc. Have you done anything about the wall behind you?