B&W CM6 towers with a Sonus Faber center??

Help!  I have a pair of B&W CM6 Towers (and an REL sub) that I use both for music and TV.  The B&W's are fine for movies, but a bit too bright and mechanical for my taste in music (and the room, which has tile floor).  Have been kind of kicking myself for not buying a pair of entry level FB towers instead of the B&W's.  Recently, I was thinking of adding a center speaker to my system both to improve the TV audio for dialog clarity and overall sound experience.  I was wondering whether an FB center speaker might be effective way to temper or compensate for the brightness of the B&W's, or whether the pairing would be incompatible.  Does anyone have any thoughts or opinions on this?  In case this helps your analysis, for amps, I have been running an ancient Yamaha AX700U which I adore, but am in the process of replacing it and am considering a Yamaha RXA1070 or RXA2070 so that I can finally move into the modern era for steaming music. It also runs a pair of outdoor def tech's on the back patio.  Any thoughts or advice any of you can provide would be really helpful.