Upgrading from Wilson Sophia 2's?

try putting some walker HDLs on the watt binding posts. will reduce the aggressiveness of the highs. might be a quick & cheap solution

If you change to a more forgiving speaker like a Verity, or a Sonus Faber, you will be giving up on the excellent Wilson clarity and dynamics.

Your issues are most certainly room and setup related. It sounds like you have done some treatments, which is a good start, but the next step is to take a more objective approach to acoustics. That low ceiling isn't working for you.

If it were me, I would look into hiring an acoustic consultant who can take full measurements of the room acoustics issues, and work with you to address the acoustic shortcomings.

If you change speakers, you will just have a different set of problems.

Cables?

Speakers differ fundamentally in their presentations based on their drivers, crossovers and design.

Trying to change a speakers' fundamental presentation with cabling is a mistake, IMO.

It's better to buy speakers from the outset that have a sonic presentation that suits the listeners preferences.

It would be better to get exactly what you want from the beginning but it is not easy and often the better the speaker the more trouble you have to go through. In his review of the Sofia 2 in HIFICRITIC Martin Colloms said "We were initially misled during the listening tests because the Sophia 2 constantly revealed the sound of every other component we used it with. Before we had learned to trust it , we had thought these' other' sounds were the responsibility of these speakers; as we learned to balance the system, it was clear that the speaker sat above these issues- a rare occurrence,especially at this relative moderate price level. --- It is the mark of a great speaker that it helps one assess the components elsewhere in the system, Sophia 2 can do this, which can make system building exacting but very rewarding. When we thought it was a bit bright, it turned out that this was due to a relative high cable impedance. Soft bass was due to 'soft' sounding cables and electronics. Midrange coloration was almost always the fault of a component other than the speaker, and the same was true of focus and transparency issues.Nothing could be taken for granted, but once all was in order , the overall sound quality seemed to fall in place."
This is the Sept/Oct 2008 issue, you might want to order it as it gives considerable info on the speaker. I have gone through similar efforts with my Apogee Duetta Sigs. , they will sound hideous if not set up optimally. In my opinion you have a pair of speakers that is very revealing and you are hearing room and equipment interactions. If you want the level of sound possible from these speakers it will be a long process but changing speakers means starting over. Less revealing speakers are easier but you give up something. I have struggled with this myself as I mentioned in my first post but if I had speakers of this quality I would exhaust every avenue before changing. I would consider having the room analyzed if there is someone competent to do this or perhaps one of the computer programs. But advice about rooms is often inconsistent and sometimes contradictory. I was told by the factory that my Apogees should have a bare back wall, I was just talking to the authorized repair station for the current manufacture of replacement parts and he told me the opposite. DON"T GIVE UP. Stan