Enzo,
What a great looking room!
I understand how you would want to get the most from your stereo system's performance. I think that due to the room aesthetic, you'll be tip-toeing around what will be "ideal" and what makes sense aesthetically. There has to be a reasonable compromise in there somewhere.
At a glance, I'd venture to say that the speakers do look to be set too wide apart for where you are sitting. I'd try to set them up for a 1:1.2 or 1:1.5 ratio, max. That is to say that if the speakers are say, 6 feet apart, tweeter to tweeter, you could sit anywhere from 6, up to 9 feet away from them. Focusing their toe-in to look at you will also help but not all speakers sound best that way. It's a matter of gradually toeing them in and out until you get what you like.
Judging from your list of components, I'd say you've invested a pretty penny for that setup. Has your local dealer made himself available to help you with this? I would think that up to a reasonable point, it might be part of his service. Talk with him and see if you can get a house call or what he'd charge for one.
Someone mentioned an area rug. I'm on board with that too, placed just forward of the speakers to absorb the "bounce" from the floor.
Cover the windows behind you when you're ready to A/B compare the effect that has on the system. If you say it sounds "dead" maybe you should leave the drapes open? Hey, I'm just guessing here, which is all any of us can do by long distance.
