I had the 4B-ST yrs ago & my findings were similar to yours. Don't forget how much the room has to do w/the overall presentation and right behind that the AC. Let's put those things on hold right now though. I also had some Kef Ref 3's, so I don't think speaker positioning is critical w/Kef's, at least in relationship to a warmer sound.
I had much better results using a different amp than the Bryston. In fact I think the Bryston was the driest amp I've ever used. Anyway, I went from the Bryston to an Aleph 5 but I also had an Aleph P with both pieces. There was a world of difference w/a much warmer sound using the two Pass pieces. Other amps that may work for you are BAT & B&K. I've had more amps than any other pieces except for cables & have found the amp to have a huge influence. As long as I don't have metal dome tweeters, I can deal w/just about any speaker.
I'm also not a fan of silver cables, so for a quick test you might want to substitute some zip cord to see how that affects what you're hearing. The silver thing goes for power cords & outlets too.
Lastly, let me just say make sure you only change one thing at a time because if you do several things at once, you'll lose hearing where you should concentrate your efforts.
I had much better results using a different amp than the Bryston. In fact I think the Bryston was the driest amp I've ever used. Anyway, I went from the Bryston to an Aleph 5 but I also had an Aleph P with both pieces. There was a world of difference w/a much warmer sound using the two Pass pieces. Other amps that may work for you are BAT & B&K. I've had more amps than any other pieces except for cables & have found the amp to have a huge influence. As long as I don't have metal dome tweeters, I can deal w/just about any speaker.
I'm also not a fan of silver cables, so for a quick test you might want to substitute some zip cord to see how that affects what you're hearing. The silver thing goes for power cords & outlets too.
Lastly, let me just say make sure you only change one thing at a time because if you do several things at once, you'll lose hearing where you should concentrate your efforts.