Unless you've got some hard wall, floor or ceiling surfaces I would suggest trying another speaker. Your supporting equipment is not bright so it must be a speaker and/or room interface problem. Every time I've heard Wilsons they have been on the fatiguing side. I'm a fan of Vandersteen because they aren't fatiguing to me, probably because if they err at all it is on the warm side. There are LOTS of speaker choices that will make a big difference so try them out if room treatements can't tame them. The room size is not an issue either, you've actually got a fairly large room. As a point of reference Harry Pearson has a smaller room and he has reported on a lot of large speaker systems.