HI Doug
I had/have an ac12 door issue about one side of any ac12 doors casings sticking out away from the jamb, around 5 or so inches!
This seems like it may not be related to what you are trying to do, but thought I'd throw out the "solution" I came up with, in long shot hope it maybe free up the option you are having trouble with.
That is that I found ac 12 doors don't like being set to 0" off the floor slab.
I could either raise them or lower them as little as .1" and that fixed the casing problem.
Good luck!
Bier