1.5 inches out of plumb is drastic. You sure about that? Maybe your level got knocked (if that's what you used). The doors should be plumb so you have to work from that. You might set the top track further into the opening and see if it works at the bottom.

Is the laundry room going to be the full size of the current raised tub area or smaller? If it's going to take up the whole space, then why not put the wall just to this side of the current wall tile, thus avoiding walling in the tile?? If that's too big, then I'd just take down the wall tile and put new drywall in. It's a pretty simple job. And it'll look better, since the tile doesn't go all the way around the space.

I just built option 3, not completely finished. I think wardrobes are typical in Europe but not in US so from the perspective of resale the traditional closet is best. So far we are happy with our choice as we had been considering sliding doors which at the length and height of our closet were priced at about what I paid for the unit. The room is small so it is difficult to get a good picture. We have triple and double height hanging and pullouts for ties/belts/shoes. A not finished piece is a vanity desk and shelves above. This post was edited by 5yearslater on Sun, Jun 2, 13 at 18:28

Bi-fold doors are often installed with flimsy hardware, and the symptoms you are noticing are typical. You could have someone put in quality, heavier-duty bi-fold hardware, or you could make the changeover to swinging doors, but you would need someone competent with the right skills and tools.