Depending on budget, I would look at something other than the Adcom amp.....besides it being an old amp, its not very musical sounding at all.
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No doubt, some speakers are inefficent and thus require some 'ooomph' to make them sing. However, you may find that a good separate pre-amp may make more of an improvement dollar for dollar than upgrading your amp, especially since you are bi-amping.
Interesting that no one has commented about your bi-amping with different amps. I've always heard that it is recommened to use identical amps when bi-amping. I wonder if using identical amps would improve the 'singing' ability of your speakers?
I'd guess the bi-amping with such dissimilar amps may be the 'problem'.
Almost any single more powerful amp will help. A good integrated which can handle the B&W load, not just impedance but phase angle as well, is recommended.
Maybe a NAD in the 37x series? That is, if you like the NAD house sound?
One of the M series integrates would work like mad, but the cost may be a little brisk.
BiPolar? MOSFET? Good bad exist with either device type. If it works well with your speakers, don't let either deter you.