All B&W speakers sound a little bright to my ears. It's their metal domes. The Epos Epic 1 uses a soft dome tweeter. I feel that most metal domes hype up the highs frequencies. They make them sound more open, clear, and bright, but I don't think you necessarily get any more actual detail from the metal dome. It only seems that way upon first hearing. Some people like that added zing a metal dome brings and others do not. While I can appreciate the metal dome sound on a short listening sessions it does bother me over long periods. There are very few metal tweeters that I could live with. The Focal Aria 906 might be one of them as it was surprisingly smooth sounding, also the metal dome tweeter in the Vandersteen 2 Signature speakers sounded non-irritating to me.
There is not much you can do as those B&W's will continue to sound bright to you. However, you can minimize the brigtness. You can change speaker and interconnect cables to smoother ones. Also, get rid of those metal jumpers on the back of the B&W's. Cheap Metal jumpers just make speakers sound brighter and harsher. Try to bi-wire the B&W's or replace the jumpers with high quality cable jumpers. I use Cardas jumpers on my Proacs and it's a good smooth choice.