Help! Advice and Recommendations please (system sounds bad)

Maybe lots of diffusers on the wall behind the Maggies.

The old pictures have the diffusers. The new room is with the wood paneling. 

Although it sounds like the xover might be the culprit, those are two very different listening spaces. If you are trying to achieve a duplicate of what you had, you probably won't get there unless you treat the new room accordingly.

OP    After being without my rig for 11 months due to a move, I am trying to dial in my system with horrible results at the new home. 

1) Your ears became normal due to not listening hi-fi seriously for 11 months. In previous house, your ears were easily get into the immersive hearing mode which ignore harsh distortion noise from your system. Also, your ears might be in numb state due to harsh audio sounds and your ears were used it. Anyway it’s a good thing that your ears can hear any sound correctly now. Use this chance wisely.

2) Check out if there is any noise around your home from construction or water fountain. Any slight sound from in/outside can disturb the hi-fi sound. Human can’t hear a natural sound and un-natural sound together at same time. Ex.1) We say to noisy talking people in audio show "please be quiet. Let me hear the music."  Ex.2) A dog barking outside can be irritation when listening music. 

Try to hear your voice and speaker’s sound together. Say "hello" repeat with your speaker sounds.

Watch  Natural sound vs. Un-natural sound comparison

Alex/Wavetouch audio

Excellent system.  Some recommendations.  
 

1:  The mids seem muddled. Not rich…When the music is displaying a strong full spectrum I lose a lot of detail and separation.  These observations appear to me to be related to room acoustics, where there is cancellation and reinforcement modes muddling the mids and loosing detail and separation, especially at increased volume where the acoustic pressure may overload the room.  The recommended fix in the literature is speaker placement and absorption room treatments.  
2:  … getting some perceived distortion and harshness when the mids peak…This is more difficult. I think you indicate system was not in use for some months.  If you have not done so already, clean all contacts and treat them with the contact enhancer of your choice, and check all tubes.  If you moved to a more populated area, you may have increased mains noise or EM emissions.   You can have this measured or buy meters.  I do not see a power conditioner listed.  You may benefit from one.  Finally, if your previous location was a solid floor and now you are on a suspended floor, you may be experiencing effects of vibration feedback.  Decoupling your speakers may help.  

Good luck experimenting.   I am confident you will get back to the SQ you remember.  Ava in, excellent, well thought out system.