Put those B&W up for sale. it is their bread and butter to have thin, harsh, edgy, sharp and piercing presentation to their midrange and treble. Some can be fixed with extra damping that is focused on certain frequencies, or you can do the best thing and out it up for sale for someone who can't hear beyond 6kHz who will like B&W's weird presentation of tonal identity.
For the Franco Serblin speaker if it is the one I think it is, they're recessed in the lower treble, but the mid treble and upper treble is obnoxious.
Room dimensions and what are your amp and source? @onehorsepony
I'd rather you go for a balanced within preference research speakers and let that be the baseline for your system