I think you will enjoy the Transparents. The Ultras are a little laid back which may be what you're looking for. They are full bodied with nice texture, authority and good inner detail - very musical. As you move up their line, the darkish quality goes away and the cables begin to open up.
I found room treatments and cables helped to tame the agressiveness of my Mezzos. Have your tried Transparent or MIT cables - probably a good match for the Altos.
