hey tonio,
Congratulations on an amazing space, it looks absolutely amazing, I'm quietly jealous
Funny that Dan should post that link (thanks DD), when I first saw your room I thought it was a shame you went to all that effort with treatment and then put your speakers where they are.
In my experience it's really important to experiment with speaker placement. Space isn't an issue for you so you've got lots of room to play with.
I think about a foot up and back would work for you too and might be worth trying out.
Let us know how it goes.