Cool thread. Some of the replies are entertaining. I’ll throw another funny one in…I’ll stop by, bring a 6 pack and listen to your system to tell you what the weakest link is.
all jokes aside, you have assembled one kick ass rig! If I was to be picky I’d say the speakers but man that’s stretching it. Those B&Ws are old but they kick butt. Wilsons will give you more resolution and more natural more refined sound but is it worth making such a major change if everything is tied together so well? Pretty sure changing speakers will trigger other changes.
Room would be another honorable mention for an improvement but you’re already working within pretty much the boundaries there…only so much you can do.