The only way to properly determine the exact cause of your issue is through experimentation. But good insight before you do never hurts.
Most of the B&W speakers I had an opportunity to listen were forward in their presentation. I fortunately have heard the 803D and 802D. They were not in the same system so I can not provide a proper comparison between the two. My impression didn't have any notion of brightness, but its presentation has a forward presence that might not mate well with some components (particularly ones that have been described in a similar way). I have heard people using Classe with excellent results and my best experience with them was paired with Naim. Another setup I heard with the 803D was surprisingly lifeless. I had forgotten what the rig was, mostly because it didn't really leave great impression.
BTW, could you provide a more detailed description of the room and speaker setup. It could greatly affect the bass performance and thus make the balance all wrong. With a speaker such as yours, system synergy and setup are two very big factors. I personally have not heard any of your gear in any system so I can not comment on them.
Most of the B&W speakers I had an opportunity to listen were forward in their presentation. I fortunately have heard the 803D and 802D. They were not in the same system so I can not provide a proper comparison between the two. My impression didn't have any notion of brightness, but its presentation has a forward presence that might not mate well with some components (particularly ones that have been described in a similar way). I have heard people using Classe with excellent results and my best experience with them was paired with Naim. Another setup I heard with the 803D was surprisingly lifeless. I had forgotten what the rig was, mostly because it didn't really leave great impression.
BTW, could you provide a more detailed description of the room and speaker setup. It could greatly affect the bass performance and thus make the balance all wrong. With a speaker such as yours, system synergy and setup are two very big factors. I personally have not heard any of your gear in any system so I can not comment on them.