I think there are two possibilities for the poop issue.
Firstly, he cannot get to the litter box quick enough. I would move it into the room where you have the sofa and see if he uses it.
Secondly, he does not like using the litter box in the room where it is, perhaps due to the smell etc. as you describe. It reminds him of bad things - i.e. him being sick. Does he ever spend any time in that room at all now?
Firstly, he cannot get to the litter box quick enough. I would move it into the room where you have the sofa and see if he uses it.
Secondly, he does not like using the litter box in the room where it is, perhaps due to the smell etc. as you describe. It reminds him of bad things - i.e. him being sick. Does he ever spend any time in that room at all now?