So.... Question for Matt....
You have your own budget speakers and indicated that they have outperformed other speakers you have listened to even including some 20k price range stuff. Is it possible that you have done things in your personal listening space to give your speakers, with good timbrel qualities, a better chance to perform well including their timbre qualities?
First, I don't think my experience of liking what I have at home over more expensive gear is novel, or even speaks necessarily to the quality of my system. I'm quite sure many here have heard expensive "audiophile" systems that they would not take over what they own.
Anyway, as to my room: Yes, it was renovated and re-designed with the input of a professional acoustician.
I actually had a discouraging encounter with the power of room acoustics. For years I'd used the front room of our house, our living room, as my two channel listening room. It's not a big room, only 13' wide and 15' deep at it's deepest (bay windows). Fortunately there is a large, wide open entrance to the room which, I believe, has helped the room seem less "small" acoustically. It never seemed to matter what speaker I put in the room, from stand mounted to full range floor stander, I always got excellent, even sound (several speaker manufacturers who visited expressed amazement at how well this room worked).
Then when I wanted to do a reno to make it also work with home theater, it necessitated switching the listening sofa and speakers 180 degrees.
When I first did this my heart broke. Things sounded like shit! Big suckout somewhere in the lower mid, other unevenness, the richness gone.
I didn't even want to listen.
But it was the only set up that would also allow me to do a projection screen in there, so I did a major reno with an acoustically knowledgeable architect and an acoustician. There's acoustic treatment "built in" to the ceiling, in to the wall behind the speakers, a nice mix of live and dead surfaces, and I have thick curtains on tracks that can be pulled along side walls to gather at any point to help reduce any problematic side wall reflections.
It's worked out fantastic. I now get probably the best sound I've ever had in my room.
(And I suspect that due to the room being very nice acoustically, and my ability to modulate the liveness of the room, this helps me get good performance from speakers of various radiation patterns, including the MBL speakers which have been accused of sounding too bright in some "normal" rooms).