In my experience rear surround speakers have a supportive role only in music. There are rare exceptions, Steely Dan and the Eagles for instance, but never to the point of justifying these rears to be as great as the Fronts.
I'm not one of the audio gurus that we like to read in this Forum but in my opinion, your setup lacks in the area of subwoofer and my I suggest that instead of changing your present surrounds, which are quite big speakers to start with, a good sub or two would do wonders for both music and movies.
You have better Energy speakers than I have but I do love mine very much.
