There are so many speakers out there that aren’t as bright as yours (Sonus Faber, for one). Sorry, you’ve just got to do the research and figure this one out for yourself, as this situation requires in-person/in-home/in-store auditioning for you to know for sure what’s best to your eras. Personally, I love the sparkle and natural tone that you get with Diamond/ Beryllium tweeters when implemented properly. My Revel Salon 2 speakers have one of the most brilliant, yet smooth, detailed and transparent, musical, non-fatiguing, tweeters I’ve ever heard (Beryllium), and I’ve heard quite a few. Go listen to as many speakers that you can, even if you have to travel to get to hear them in person. That’s the best (only) way. Also, you can always try to tone down the tweeters of the B&W's by trying to power them with tubes, experimenting with cables, components, etc.. If I were in your shoes, I’d ditch the speakers. Happy listening.
