Nugget your not going to like this but wait a minute before ruling it all out.
Your buggest problem in that room is lack of space - its long and very narrow - I think you havbe bought a lot of the wrong stuff and it might be an idea to semi start again.
For starters when space is lacking itsa best to buy wall mounted speakers not book shelves becasue you dont have the space.
You also want small speakers because its a small room.
The benefit of wall mounted speakers is getting them up off the floor so there is floor retail available for subwoofers to sit.
Now your sitting off the boundary and in the middle of the room you will get miminal room gain and minimum output from a sub - the middle of the room is where there is least bass pressure - this is not the end of the world I sit in the middle too but you have to factor this in.
This is what I think I would have done in the space
This is not to scale.
Had you been to a proper dealer they would have advised wall mounted straight away
Look at this dealer
Seriously Cinema - this is his home atmos / dts x / auro Cinema
Its a tight space but its in there integrated nicely and neatly and souds very good