OP,
I think we are zeroing in on the problem. You are looking for crazy high bass.
B&W are know to be very bass heavy. And you you owned B&W803’s and did not think they had enough bass. So, what is going on here sounds like you want a very bass heavy system. If you want accuracy down to the bass and then a big kick, you are going to have to use subwoofers. and adjust them for the kick you are missing. Amati’s are made to sound natural and accurate down to around 28 hz or so and they sound that way,
I got rid of my subwoofers when I got my Amati Traditional. Don’t miss them at all, plenty of bass, Note, Sonus Faber makes three levels of subwoofers. That Gravitas are absolutely beautiful and match the Amati.
Alternatively you could go with the current top of the line B&W 800 speakers and massive MacIntosh monoblocks. These really rock and are very bass heavy. On the other hand MacIntosh is details / high frequency light... so the might create a problem for you.