[Prof.]

salvasol,
In a narrow theatre room you will have to have some compromises...
Two rows of 3 seats is probably expecting a bit too much in that width..

My suggestion would be to definitely reverse the room, otherwise you will always have your set off centre, which detracts from the overall setup, and loose one of the back row seats...if that's possible..
That way, people coming into the theatre will have more room to enter, and you will only need to squeeze through to the front row seats..

I realise that this means a lot of extra work and re-arranging on your part, but if you want the room to look more theatre like, then I don't see any other way of doing it...