Kef Blade or Kef Blade Two for bigger room

Hello all, I am thinking of changing my old bw 800 matrix speakers for the Kef Blade or Blade two.

My living room is 4.8m by 9.3m, with partially sloped high ceeling, and also in the middle going over into my open kitchen adding another 2.5m by 6m... 
Logically I would go for the biggest Blade to get the most and deepest bass response, as most speakers I have tried are too bass shy in my room, except for the big bw800 matrixes, which I set up in middle of the room, and sofa against wall to get bass...
Amplification are Rowland model 9T, so they should get the job done with both speakers.

However I heard from a dealer that the Blade two are better, more coherent sounding, even for bigger rooms; he claimed the big Blade sounds less coherent, with bass floating in the air somewhere and a bit disconnected from the rest...
In my personal experience I heard a Blade two driven by Electrocompaniet Nemos on a music show, im a large rectangular room, and they were brilliant, also in bass.
  i heard the big Blades at a dealer with my model 9t s and they were great as well, but strangely bass shy... room was large enough, but had sloped ceelings to the sides, and the speakers stood on small transporting rollers, so 10 cm higher then normal... Is it possible bass is better from the small blades after all??
Advice would be greatly appreciated! Maybe anyone heard them side by side in same room and with same amps?