I dont know Bryston because I have never heard one. I have been a Thiel owner for 16 years, 3.6 and now CS6. The only power amps I have used with them are Classe CA200 and Mcintosh 501 monos. Both high current and more on the forgiving side of neutral. Seems like I have heard Bryston is on the sharper side.
I have also always had tubes in the preamp stage. I can't say bad recordings are a problem (other than being bad) or intolerable with either speaker in my setup. Careful matching is critical with any Thiel, I have always built around them for that reason. Not saying you have made bad choices just sharing mine. Thiels have to run the show in the system, there are classic matches and risky ones!
I have also always had tubes in the preamp stage. I can't say bad recordings are a problem (other than being bad) or intolerable with either speaker in my setup. Careful matching is critical with any Thiel, I have always built around them for that reason. Not saying you have made bad choices just sharing mine. Thiels have to run the show in the system, there are classic matches and risky ones!