You have more than enough power now, more is not going to help. I suspect that what you are beng limited by is the Bryston. Those are phenomenally well made amplifiers, and with an amazing warranty, but they are a bit sterile, in my experience.
Listen to ZD, something like a BAT VK75SE, or Pass 60.5's would offer a lot more for your solution.
Listen to ZD, something like a BAT VK75SE, or Pass 60.5's would offer a lot more for your solution.