You're reporting lack of depth of soundstage and rolling off of the highs.

Things to try:

1. Move the 60s away from the front wall and into the room. Does the soundstage get deeper?

2. Experiment toeing the 60s inward so that the tweeters are facing you.

3. Cover the floor in front of you with a rug.

Make sure the shorting strap between the terminals on the back is in place.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated