New Speakers under consideration - but I’m afraid

TAD E2.

Good speakers are Gawd-awful expensive.  Because you are bi-amping already, I recommend that instead of taking out a 2nd mortgage to buy new speakers and having to figure out who you can dump your old ones on, get yourself a miniDSP DDRC24 active crossover, with DSP EQ, along with the measurement mike they have.  The DDRC24 includes the Dirac DSP EQ system.  Measure your system in your room and then you can have Dirac create a custom EQ filter for your room.  The difference is incredible.  The whole thing will cost  you hundreds of dollars, not thousands.

I'd certainly look at Joseph Audio, Pulsar 2 Graphene for standmounts $10,000, or Perspective 2 Graphene for floorstanders $17,000. The only brand of speakers that most will agree are amazing speakers for their price point.

Sonus Faber, but I can't recommend models

Volti Luceras, horn loaded and super dynamic, on my final list for my next upgrade along with the Joseph Audio

I lived in Barbados for a year.  Consider how humidity can affect the speakers and their sound.   

Like others here, another vote for Rockport if you can afford them, which i cannot--they are my win the lottery speakers--having heard several versions on multiple occasions i have yet to hear a better speaker at any price and they would easily surpass your current B&Ws.  Did you mention a budget?  If so i missed it--but the speakers you listed are pretty far apart in price range.  i assumed since you mentioned Sasha that Rockport could be in the picture...happy listening.