Leaning interior rake wall – top plate pulling away from ridge beam king post.

1978 (pre-code) west coast style curiosity of a house, 2 storey, 2×6, 16″ OC framed with a crawl space on a concrete poured foundation. House is an L shape, with large cathedral ceilings (see photo). Mercifully I have the original construction drawings/blueprints that are well detailed.
Recently, I removed a built in closet from the master bedroom, and before drywall, I want to address a rake wall that appears to be pulling away from the (2×12) ridge beam, king post. The home has no rafter ties, owing to the low- cathedral ceilings. Future works include engaging with a structural engineer to address walls that are out of plumb a good 1.5″ over 4 feet (I believe the roof has spread over the last 50 years) given the cathedral design. Having some metal collar ties or something is likely on the cards in the future.
In the interim, I am wondering how I can pull the topplate of this rake wall back towards the king post that sits under the ridge beam. The rafters are 2×10 doug fir 16 OC. There are two existing 2×4 supports from where the closet previously connected that I will remove and replace with a 2×6 stud. The gap that has opened up is a good around 3/8″.
Intrigued as to peoples thoughts as to what to do.
Replies
Photo of offending sea ranch house.
Is the movement telegraphing in the drywall on the other side of the wall? Are the studs all 3/8" out of plumb? I'd have a hard time believing you could "pull" the wall in any case, there would be so many forces in the assembly opposing, whatever you pulled on would likely break.
zoocat,
My initial reaction is, "Yeah. Umm, Sea Ranch. Whaddaya expect? Architect's delite. Framer's nightmare."
But, snarkiness aside, your note makes me wonder if there was actually any motion. Both the drywall and the siding should show evidence of that 3/8 movement.
I've seen "swaybacked" buildings where the eave walls have spread, curving out between the gable ends. No real ridge beam, just a ridge board for the rafters to die into. Missing or inadequate collar ties/joists.The gables pretty much keep their original height, but get dragged toward the center by the sagging ridge board. But this doesn't look like that kind of situation.
Maybe the framers came up 3/8 short on the gable top plate, decided they just didn't care. "Ehh, the drywallers will cover it and nobody else will ever see it."