Well, folks, the DE trick just may have done it. I put a couple of handfulls in last night, and this morning, I had a very clean looking pool.

I had some dust settle on the floor, but it was all clumped together in 3-4 spots, so I just set the vac to waste and sucked that stuff right now.

Feels nice to have something that resembles a clean pool again. Many thanks to Watermom, Janet, and PoolDoc for all the help!