B&W 802D1 - How can I tame the brightness?

A high quality graphic equalizer. Or you could search for just the combination of components and cables forever. 

I'd recommend selling those to someone who likes them and buying speakers that sound the way you want. 

Good point... any suggestions for full sounding speakers that don't have that B&W Diamond ear bleed?

So many to choose between. What's your price point?

Franco Serblin is one of my favorites especially after hearing them at Axpona. 

wow, never even heard of them....I'm looking for a retirement system, so i'm in the price range of around 20-25 thousand.

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