Do you think that stringing the B through the body helps with this at all? I did find a slight improvement, when I strung my Fender Roscoe Beck 5 though the body rather than through the bridge; but I wondered if I was just noticing other aspects and their impact on the sound.
As Brad mentioned, I tend to accept that the B is going to have to be treated differently as it is so thick in comparison. I suppose, for those who are unhappy with their B string, they could try lighter gauge, but I tend to prefer a balanced set and wouldn't want to go any lighter, just for this.
I also noticed that Yamaha's new TRBs have adopted the same sort of bridge as the Dingwall's - individual units per string, but I'm not sure this made the B string any better than basses with a normal one-piece bridge. Difficult to judge though as the example I tried, had loose bridge units for the B and G strings.