I use 803D mains and a B&W ASW825 sub with HTM2 center and 805s for the rears. This works very well for HT, but I run only the 803D for stereo and have been very satisfied with the base. Perhaps some speaker positioning or room adjustment/treatment could help? Also the B&W is a bit of a difficult load, especially the big guys like you have- maybe a bigger amp?
How To Add A Sub To B&W N802's
I am thinking about buying one of the B&W 800 series subwoofers to my N802's. I honestly know nothing about how to go about this or if it is even a good idea? I thought about upgrading to bigger B&W's like the 801's but thought this might be an easier and cheaper route. Any advice on this at all?