STATUS UPDATE BY OP - After several days of adjusting the torsion bars (TB) >>> driving around >>> adjusting >>> driving >>> repeat, repeat, I finally got the left-side sag (low) taken care of. It's now level left-to-right. I was able to accomplish "L-R level" without having to make the front end higher than the rear end... and I didn't have to swap the rear leaf springs.
At the same time, I was monitoring the front cambers. Before any TB adjustments, the front left had developed quite a bit of -camber. The left side was the side that sagged. Tightening the left torsion bar did not get rid of the -camber, so I had to install a a set of camber cams on the left front.
The right front doesn't need a set of camber cams.
I ended up removing the sway bar during the adjust-drive-adjust-repeat process because it seemed to be affecting the adjustments. In fact, it was so tight (middle portion) on the right front that it destroyed one of the "inside" rubber bushings. It's weird, but in order to reinstall the sway bar, I think I'm going to have to customize the length of the "middle portion" of the front right sway bar link to make it shorter than the left front link.