Sargentfriday I have the same pre and power amp as you :) But I am not using B&W's. There are two ways to suppress the brightness - one is by tube rolling, but the better way would be to cover up your windows with curtains.
If you are using the standard tubes that come with the SLP-05 and 211AE, these are very bright and glary. I replaced all the 6SN7's in the SLP-05 with RCA's - a bit less top end, fuller and sweeter midrange, but a little bit lacking in dynamics. I will shortly be replacing the 845's in the 211AE with Cetrons. Rolling the 300B in the 211AE does not make as much of a difference compared to rolling the input and output tubes. It is also the most expensive.
If you are using the standard tubes that come with the SLP-05 and 211AE, these are very bright and glary. I replaced all the 6SN7's in the SLP-05 with RCA's - a bit less top end, fuller and sweeter midrange, but a little bit lacking in dynamics. I will shortly be replacing the 845's in the 211AE with Cetrons. Rolling the 300B in the 211AE does not make as much of a difference compared to rolling the input and output tubes. It is also the most expensive.