Hi! I'm installing bifold doors into a 72"w opening. Turns out the walls aren't plumb - the bottom is about 1.5" further out than the top of the wall. I'm using Johnson Hardware 1601 Series Folding Door Hardware instead of the more common "tracks". I'm trying to figure out if I should make the door casing plumb from top to bottom even though the bottom frame would protrude out 1.5" more than the top of the casing. OR....should I keep the door frame in line with the out-of-plumb wall. It seems like there's a logical answer here but, so far, I'm not getting it. Any ideas would be greatly appreciated!! THANKS!