You may want to try toeing in your Klipsches in such a way so that they "focus" about a foot or two away from your nose. That may remove the brightness. As for whether or not you will be happy with the M80s compared to the RF83s, let me just say that there simply is no comparison (at least in my space). I auditioned both side-by-side in my home theater and can summarize by saying that the RF83s are like a monster truck while the M80s are like a finely-tuned sports car.