You can go in one of two directions...warmer amp or different speakers.
The Cronus is wonderful but it is not known for its warmth. Rogue gear is brilliant (I own a Hydra) but the relatively linear nature of its sound means if will leave the 805 D3s a little bright.
You could look at either VTL or VAC as really good options for warmer sounding integrated amps that will soften the sound of those B&Ws. Another option would be look at a hybrid integrated like the AVM Evolution A 5.2. It has a tube input stage that will warm the sound with a neutral SS output stage. Naim and Pass would be other really good options for SS gear.
For speakers, i would encourage you to look at my (Verdant Audio) Nightshade Speakers. They are incredibly revealing but aren't quite as bright as the 805 D3s. Another customer bought them on here recently and there is a review at Shoestring Audiophile. Others coming.
http://theshoestringaudiophile.com/dark-and-handsome-verdant-audio-nightshade-speakers/
Another brilliant option would be something like the Spendor D7.2. For a smallish floorstander, it delivers a natural sound but is unbelievably revealing and should work well with the Cronus.
I offer a 30 day in-home trial on my speakers and will take your B&Ws on trade vs. my speakers or the Spendors if you find them interesting. I am also an AVM dealer and would take your Cronus on trade vs. an AVM 5.2.
PM me if you are interested in any of these options.