You mentioned that your ceiling is vaulted. Is the listening position under the short side or the tall side?
It sounds like you have absorption panels behind the speakers. Have you tried diffusion instead?
In my room I am 8 feet from the speakers and they are about 7 feet apart by necessity. My soundstage is very focused and can sound deep, but doesn't go that wide. I've experimented quite a bit with speaker positioning and that is where I ended up in my 12 foot span. Your soundstage issues may largely (though not necessarily completely) be around the positioning of the speakers in the room.
I thought you already were using the Cary, but I see you are not. What is the rest of your system that you're forming these impressions by?
It sounds like you have absorption panels behind the speakers. Have you tried diffusion instead?
In my room I am 8 feet from the speakers and they are about 7 feet apart by necessity. My soundstage is very focused and can sound deep, but doesn't go that wide. I've experimented quite a bit with speaker positioning and that is where I ended up in my 12 foot span. Your soundstage issues may largely (though not necessarily completely) be around the positioning of the speakers in the room.
I also want to try tubes and am afraid the Ushers won't like them, though I have yet to experiment.
I thought you already were using the Cary, but I see you are not. What is the rest of your system that you're forming these impressions by?